Bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/build.yml

@@ -14,9 +14,6 @@ on:
     paths-ignore:
     - '**.md'
 
-permissions:
-  contents: read
-
 jobs:
   build:
     strategy:
@@ -83,48 +80,3 @@ jobs:
         name: runner-package-${{ matrix.runtime }}
         path: |
           _package
-
-  docker:
-    strategy:
-      matrix:
-        os: [ ubuntu-latest, ubuntu-24.04-arm ]
-        include:
-          - os: ubuntu-latest
-            docker_platform: linux/amd64
-          - os: ubuntu-24.04-arm
-            docker_platform: linux/arm64
-    runs-on: ${{ matrix.os }}
-    steps:
-    - uses: actions/checkout@v6
-
-    - name: Get latest runner version
-      id: latest_runner
-      uses: actions/github-script@v8
-      with:
-        github-token: ${{secrets.GITHUB_TOKEN}}
-        script: |
-          const release = await github.rest.repos.getLatestRelease({
-            owner: 'actions',
-            repo: 'runner',
-          });
-          const version = release.data.tag_name.replace(/^v/, '');
-          core.setOutput('version', version);
-
-    - name: Setup Docker buildx
-      uses: docker/setup-buildx-action@v3
-
-    - name: Build Docker image
-      uses: docker/build-push-action@v6
-      with:
-        context: ./images
-        load: true
-        platforms: ${{ matrix.docker_platform }}
-        tags: |
-          ${{ github.sha }}:latest
-        build-args: |
-          RUNNER_VERSION=${{ steps.latest_runner.outputs.version }}
-
-    - name: Test Docker image
-      run: |
-        docker run --rm ${{ github.sha }}:latest ./run.sh --version
-  

.github/workflows/docker-publish.yml

@@ -1,75 +0,0 @@
-name: Publish DockerImage from Release Branch
-
-on:
-  workflow_dispatch:
-    inputs:
-      releaseBranch:
-        description: 'Release Branch (releases/mXXX)'
-        required: true
-
-jobs:
-  publish-image:
-    runs-on: ubuntu-latest
-    permissions:
-      contents: read
-      packages: write
-      id-token: write
-      attestations: write
-    env:
-      REGISTRY: ghcr.io
-      IMAGE_NAME: ${{ github.repository_owner }}/actions-runner
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v6
-        with:
-          ref: ${{ github.event.inputs.releaseBranch }}
-
-      - name: Compute image version
-        id: image
-        uses: actions/github-script@v8
-        with:
-          script: |
-            const fs = require('fs');
-            const runnerVersion = fs.readFileSync('${{ github.workspace }}/releaseVersion', 'utf8').replace(/\n$/g, '');
-            console.log(`Using runner version ${runnerVersion}`);
-            if (!/^\d+\.\d+\.\d+$/.test(runnerVersion)) {
-              throw new Error(`Invalid runner version: ${runnerVersion}`);
-            }
-            core.setOutput('version', runnerVersion);
-
-      - name: Setup Docker buildx
-        uses: docker/setup-buildx-action@v3
-
-      - name: Log into registry ${{ env.REGISTRY }}
-        uses: docker/login-action@v3
-        with:
-          registry: ${{ env.REGISTRY }}
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-
-      - name: Build and push Docker image
-        id: build-and-push
-        uses: docker/build-push-action@v6
-        with:
-          context: ./images
-          platforms: |
-            linux/amd64
-            linux/arm64
-          tags: |
-            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ steps.image.outputs.version }}
-            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
-          build-args: |
-            RUNNER_VERSION=${{ steps.image.outputs.version }}
-          push: true
-          labels: |
-            org.opencontainers.image.source=${{github.server_url}}/${{github.repository}}
-            org.opencontainers.image.licenses=MIT
-          annotations: |
-            org.opencontainers.image.description=https://github.com/actions/runner/releases/tag/v${{ steps.image.outputs.version }}
-
-      - name: Generate attestation
-        uses: actions/attest-build-provenance@v3
-        with:
-          subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
-          subject-digest: ${{ steps.build-and-push.outputs.digest }}
-          push-to-registry: true

.github/workflows/release.yml

@@ -16,7 +16,7 @@ jobs:
     # Make sure ./releaseVersion match ./src/runnerversion
     # Query GitHub release ensure version is not used
     - name: Check version
-      uses: actions/github-script@v8
+      uses: actions/github-script@v8.0.0
       with:
         github-token: ${{secrets.GITHUB_TOKEN}}
         script: |
@@ -171,7 +171,7 @@ jobs:
     # Create ReleaseNote file
     - name: Create ReleaseNote
       id: releaseNote
-      uses: actions/github-script@v8
+      uses: actions/github-script@v8.0.0
       with:
         github-token: ${{secrets.GITHUB_TOKEN}}
         script: |
@@ -300,7 +300,7 @@ jobs:
 
       - name: Compute image version
         id: image
-        uses: actions/github-script@v8
+        uses: actions/github-script@v8.0.0
         with:
           script: |
             const fs = require('fs');
@@ -334,9 +334,8 @@ jobs:
           push: true
           labels: |
             org.opencontainers.image.source=${{github.server_url}}/${{github.repository}}
-            org.opencontainers.image.licenses=MIT
-          annotations: |
             org.opencontainers.image.description=https://github.com/actions/runner/releases/tag/v${{ steps.image.outputs.version }}
+            org.opencontainers.image.licenses=MIT
 
       - name: Generate attestation
         uses: actions/attest-build-provenance@v3

images/Dockerfile

@@ -1,12 +1,12 @@
 # Source: https://github.com/dotnet/dotnet-docker
-FROM mcr.microsoft.com/dotnet/runtime-deps:8.0-noble AS build
+FROM mcr.microsoft.com/dotnet/runtime-deps:8.0-jammy AS build
 
 ARG TARGETOS
 ARG TARGETARCH
 ARG RUNNER_VERSION
 ARG RUNNER_CONTAINER_HOOKS_VERSION=0.7.0
-ARG DOCKER_VERSION=29.0.2
+ARG DOCKER_VERSION=29.0.1
-ARG BUILDX_VERSION=0.30.1
+ARG BUILDX_VERSION=0.30.0
 
 RUN apt update -y && apt install curl unzip -y
 
@@ -36,12 +36,12 @@ RUN export RUNNER_ARCH=${TARGETARCH} \
         "https://github.com/docker/buildx/releases/download/v${BUILDX_VERSION}/buildx-v${BUILDX_VERSION}.linux-${TARGETARCH}" \
     && chmod +x /usr/local/lib/docker/cli-plugins/docker-buildx
 
-FROM mcr.microsoft.com/dotnet/runtime-deps:8.0-noble
+FROM mcr.microsoft.com/dotnet/runtime-deps:8.0-jammy
 
 ENV DEBIAN_FRONTEND=noninteractive
 ENV RUNNER_MANUALLY_TRAP_SIG=1
 ENV ACTIONS_RUNNER_PRINT_LOG_TO_STDOUT=1
-ENV ImageOS=ubuntu24
+ENV ImageOS=ubuntu22
 
 # 'gpg-agent' and 'software-properties-common' are needed for the 'add-apt-repository' command that follows
 RUN apt update -y \
@@ -54,6 +54,8 @@ RUN add-apt-repository ppa:git-core/ppa \
     && apt install -y git \
     && rm -rf /var/lib/apt/lists/*
 
+WORKDIR /home/runner
+
 RUN adduser --disabled-password --gecos "" --uid 1001 runner \
     && groupadd docker --gid 123 \
     && usermod -aG sudo runner \
@@ -62,8 +64,6 @@ RUN adduser --disabled-password --gecos "" --uid 1001 runner \
     && echo "Defaults env_keep += \"DEBIAN_FRONTEND\"" >> /etc/sudoers \
     && chmod 777 /home/runner
 
-WORKDIR /home/runner
-
 COPY --chown=runner:docker --from=build /actions-runner .
 COPY --from=build /usr/local/lib/docker/cli-plugins/docker-buildx /usr/local/lib/docker/cli-plugins/docker-buildx
 

src/Misc/externals.sh

@@ -6,8 +6,8 @@ NODE_URL=https://nodejs.org/dist
 NODE_ALPINE_URL=https://github.com/actions/alpine_nodejs/releases/download
 # When you update Node versions you must also create a new release of alpine_nodejs at that updated version.
 # Follow the instructions here: https://github.com/actions/alpine_nodejs?tab=readme-ov-file#getting-started
-NODE20_VERSION="20.19.6"
+NODE20_VERSION="20.19.5"
-NODE24_VERSION="24.12.0"
+NODE24_VERSION="24.11.1"
 
 get_abs_path() {
   # exploits the fact that pwd will print abs path when no args

src/Misc/layoutroot/safe_sleep.sh

@@ -1,36 +1,5 @@
 #!/bin/bash
 
-# try to use sleep if available
-if [ -x "$(command -v sleep)" ]; then
-    sleep "$1"
-    exit 0
-fi
-
-# try to use ping if available
-if [ -x "$(command -v ping)" ]; then
-    ping -c $(( $1 + 1 )) 127.0.0.1 > /dev/null
-    exit 0
-fi
-
-# try to use read -t from stdin/stdout/stderr if we are in bash
-if [ -n "$BASH_VERSION" ]; then
-    if command -v read >/dev/null 2>&1; then
-        if [ -t 0 ]; then
-            read -t "$1" -u 0 || :;
-            exit 0
-        fi
-        if [ -t 1 ]; then
-            read -t "$1" -u 1 || :;
-            exit 0
-        fi
-        if [ -t 2 ]; then
-            read -t "$1" -u 2 || :;
-            exit 0
-        fi
-    fi
-fi
-
-# fallback to a busy wait
 SECONDS=0
 while [[ $SECONDS -lt $1 ]]; do
     :

src/Runner.Worker/ActionManifestManager.cs

@@ -316,7 +316,6 @@ namespace GitHub.Runner.Worker
                 Schema = _actionManifestSchema,
                 // TODO: Switch to real tracewriter for cutover
                 TraceWriter = new GitHub.Actions.WorkflowParser.ObjectTemplating.EmptyTraceWriter(),
-                AllowCaseFunction = false,
             };
 
             // Expression values from execution context

src/Runner.Worker/ActionManifestManagerLegacy.cs

@@ -315,7 +315,6 @@ namespace GitHub.Runner.Worker
                     maxBytes: 10 * 1024 * 1024),
                 Schema = _actionManifestSchema,
                 TraceWriter = executionContext.ToTemplateTraceWriter(),
-                AllowCaseFunction = false,
             };
 
             // Expression values from execution context

src/Sdk/DTExpressions2/Expressions2/ExpressionConstants.cs

@@ -9,7 +9,6 @@ namespace GitHub.DistributedTask.Expressions2
     {
         static ExpressionConstants()
         {
-            AddFunction<Case>("case", 3, Byte.MaxValue);
             AddFunction<Contains>("contains", 2, 2);
             AddFunction<EndsWith>("endsWith", 2, 2);
             AddFunction<Format>("format", 1, Byte.MaxValue);

src/Sdk/DTExpressions2/Expressions2/ExpressionParser.cs

@@ -17,10 +17,9 @@ namespace GitHub.DistributedTask.Expressions2
             String expression,
             ITraceWriter trace,
             IEnumerable<INamedValueInfo> namedValues,
-            IEnumerable<IFunctionInfo> functions,
+            IEnumerable<IFunctionInfo> functions)
-            Boolean allowCaseFunction = true)
         {
-            var context = new ParseContext(expression, trace, namedValues, functions, allowCaseFunction);
+            var context = new ParseContext(expression, trace, namedValues, functions);
             context.Trace.Info($"Parsing expression: <{expression}>");
             return CreateTree(context);
         }
@@ -350,10 +349,6 @@ namespace GitHub.DistributedTask.Expressions2
             {
                 throw new ParseException(ParseExceptionKind.TooManyParameters, token: @operator, expression: context.Expression);
             }
-            else if (functionInfo.Name.Equals("case", StringComparison.OrdinalIgnoreCase) && function.Parameters.Count % 2 == 0)
-            {
-                throw new ParseException(ParseExceptionKind.EvenParameters, token: @operator, expression: context.Expression);
-            }
         }
 
         /// <summary>
@@ -416,12 +411,6 @@ namespace GitHub.DistributedTask.Expressions2
             String name,
             out IFunctionInfo functionInfo)
         {
-            if (String.Equals(name, "case", StringComparison.OrdinalIgnoreCase) && !context.AllowCaseFunction)
-            {
-                functionInfo = null;
-                return false;
-            }
-
             return ExpressionConstants.WellKnownFunctions.TryGetValue(name, out functionInfo) ||
                 context.ExtensionFunctions.TryGetValue(name, out functionInfo);
         }
@@ -429,7 +418,6 @@ namespace GitHub.DistributedTask.Expressions2
         private sealed class ParseContext
         {
             public Boolean AllowUnknownKeywords;
-            public Boolean AllowCaseFunction;
             public readonly String Expression;
             public readonly Dictionary<String, IFunctionInfo> ExtensionFunctions = new Dictionary<String, IFunctionInfo>(StringComparer.OrdinalIgnoreCase);
             public readonly Dictionary<String, INamedValueInfo> ExtensionNamedValues = new Dictionary<String, INamedValueInfo>(StringComparer.OrdinalIgnoreCase);
@@ -445,8 +433,7 @@ namespace GitHub.DistributedTask.Expressions2
                 ITraceWriter trace,
                 IEnumerable<INamedValueInfo> namedValues,
                 IEnumerable<IFunctionInfo> functions,
-                Boolean allowUnknownKeywords = false,
+                Boolean allowUnknownKeywords = false)
-                Boolean allowCaseFunction = true)
             {
                 Expression = expression ?? String.Empty;
                 if (Expression.Length > ExpressionConstants.MaxLength)
@@ -467,7 +454,6 @@ namespace GitHub.DistributedTask.Expressions2
 
                 LexicalAnalyzer = new LexicalAnalyzer(Expression);
                 AllowUnknownKeywords = allowUnknownKeywords;
-                AllowCaseFunction = allowCaseFunction;
             }
 
             private class NoOperationTraceWriter : ITraceWriter

src/Sdk/DTExpressions2/Expressions2/ParseException.cs

@@ -29,9 +29,6 @@ namespace GitHub.DistributedTask.Expressions2
                 case ParseExceptionKind.TooManyParameters:
                     description = "Too many parameters supplied";
                     break;
-                case ParseExceptionKind.EvenParameters:
-                    description = "Even number of parameters supplied, requires an odd number of parameters";
-                    break;
                 case ParseExceptionKind.UnexpectedEndOfExpression:
                     description = "Unexpected end of expression";
                     break;

src/Sdk/DTExpressions2/Expressions2/ParseExceptionKind.cs

@@ -6,7 +6,6 @@
         ExceededMaxLength,
         TooFewParameters,
         TooManyParameters,
-        EvenParameters,
         UnexpectedEndOfExpression,
         UnexpectedSymbol,
         UnrecognizedFunction,

src/Sdk/DTExpressions2/Expressions2/Sdk/Functions/Case.cs

@@ -1,45 +0,0 @@
-#nullable disable // Consider removing in the future to minimize likelihood of NullReferenceException; refer https://learn.microsoft.com/en-us/dotnet/csharp/nullable-references
-
-using System;
-using GitHub.Actions.Expressions.Data;
-
-namespace GitHub.DistributedTask.Expressions2.Sdk.Functions
-{
-    internal sealed class Case : Function
-    {
-        protected sealed override Object EvaluateCore(
-            EvaluationContext context,
-            out ResultMemory resultMemory)
-        {
-            resultMemory = null;
-            // Validate argument count - must be odd (pairs of predicate-result plus default)
-            if (Parameters.Count % 2 == 0)
-            {
-                throw new InvalidOperationException("case requires an odd number of arguments");
-            }
-
-            // Evaluate predicate-result pairs
-            for (var i = 0; i < Parameters.Count - 1; i += 2)
-            {
-                var predicate = Parameters[i].Evaluate(context);
-
-                // Predicate must be a boolean
-                if (predicate.Kind != ValueKind.Boolean)
-                {
-                    throw new InvalidOperationException("case predicate must evaluate to a boolean value");
-                }
-
-                // If predicate is true, return the corresponding result
-                if ((Boolean)predicate.Value)
-                {
-                    var result = Parameters[i + 1].Evaluate(context);
-                    return result.Value;
-                }
-            }
-
-            // No predicate matched, return default (last argument)
-            var defaultResult = Parameters[Parameters.Count - 1].Evaluate(context);
-            return defaultResult.Value;
-        }
-    }
-}

src/Sdk/DTObjectTemplating/ObjectTemplating/TemplateContext.cs

@@ -86,12 +86,6 @@ namespace GitHub.DistributedTask.ObjectTemplating
 
         internal ITraceWriter TraceWriter { get; set; }
 
-        /// <summary>
-        /// Gets or sets a value indicating whether the case expression function is allowed.
-        /// Defaults to true. Set to false to disable the case function.
-        /// </summary>
-        internal Boolean AllowCaseFunction { get; set; } = true;
-
         private IDictionary<String, Int32> FileIds
         {
             get

src/Sdk/DTObjectTemplating/ObjectTemplating/Tokens/TemplateToken.cs

@@ -57,7 +57,7 @@ namespace GitHub.DistributedTask.ObjectTemplating.Tokens
             var originalBytes = context.Memory.CurrentBytes;
             try
             {
-                var tree = new ExpressionParser().CreateTree(expression, null, context.GetExpressionNamedValues(), context.ExpressionFunctions, allowCaseFunction: context.AllowCaseFunction);
+                var tree = new ExpressionParser().CreateTree(expression, null, context.GetExpressionNamedValues(), context.ExpressionFunctions);
                 var options = new EvaluationOptions
                 {
                     MaxMemory = context.Memory.MaxBytes,
@@ -94,7 +94,7 @@ namespace GitHub.DistributedTask.ObjectTemplating.Tokens
             var originalBytes = context.Memory.CurrentBytes;
             try
             {
-                var tree = new ExpressionParser().CreateTree(expression, null, context.GetExpressionNamedValues(), context.ExpressionFunctions, allowCaseFunction: context.AllowCaseFunction);
+                var tree = new ExpressionParser().CreateTree(expression, null, context.GetExpressionNamedValues(), context.ExpressionFunctions);
                 var options = new EvaluationOptions
                 {
                     MaxMemory = context.Memory.MaxBytes,
@@ -123,7 +123,7 @@ namespace GitHub.DistributedTask.ObjectTemplating.Tokens
             var originalBytes = context.Memory.CurrentBytes;
             try
             {
-                var tree = new ExpressionParser().CreateTree(expression, null, context.GetExpressionNamedValues(), context.ExpressionFunctions, allowCaseFunction: context.AllowCaseFunction);
+                var tree = new ExpressionParser().CreateTree(expression, null, context.GetExpressionNamedValues(), context.ExpressionFunctions);
                 var options = new EvaluationOptions
                 {
                     MaxMemory = context.Memory.MaxBytes,
@@ -152,7 +152,7 @@ namespace GitHub.DistributedTask.ObjectTemplating.Tokens
             var originalBytes = context.Memory.CurrentBytes;
             try
             {
-                var tree = new ExpressionParser().CreateTree(expression, null, context.GetExpressionNamedValues(), context.ExpressionFunctions, allowCaseFunction: context.AllowCaseFunction);
+                var tree = new ExpressionParser().CreateTree(expression, null, context.GetExpressionNamedValues(), context.ExpressionFunctions);
                 var options = new EvaluationOptions
                 {
                     MaxMemory = context.Memory.MaxBytes,

src/Sdk/DTPipelines/Pipelines/ObjectTemplating/PipelineTemplateConverter.cs

@@ -663,7 +663,7 @@ namespace GitHub.DistributedTask.Pipelines.ObjectTemplating
             var node = default(ExpressionNode);
             try
             {
-                node = expressionParser.CreateTree(condition, null, namedValues, functions, allowCaseFunction: context.AllowCaseFunction) as ExpressionNode;
+                node = expressionParser.CreateTree(condition, null, namedValues, functions) as ExpressionNode;
             }
             catch (Exception ex)
             {

src/Sdk/Expressions/ExpressionConstants.cs

@@ -10,7 +10,6 @@ namespace GitHub.Actions.Expressions
     {
         static ExpressionConstants()
         {
-            AddFunction<Case>("case", 3, Byte.MaxValue);
             AddFunction<Contains>("contains", 2, 2);
             AddFunction<EndsWith>("endsWith", 2, 2);
             AddFunction<Format>("format", 1, Byte.MaxValue);

src/Sdk/Expressions/ExpressionParser.cs

@@ -17,10 +17,9 @@ namespace GitHub.Actions.Expressions
             String expression,
             ITraceWriter trace,
             IEnumerable<INamedValueInfo> namedValues,
-            IEnumerable<IFunctionInfo> functions,
+            IEnumerable<IFunctionInfo> functions)
-            Boolean allowCaseFunction = true)
         {
-            var context = new ParseContext(expression, trace, namedValues, functions, allowCaseFunction: allowCaseFunction);
+            var context = new ParseContext(expression, trace, namedValues, functions);
             context.Trace.Info($"Parsing expression: <{expression}>");
             return CreateTree(context);
         }
@@ -350,10 +349,6 @@ namespace GitHub.Actions.Expressions
             {
                 throw new ParseException(ParseExceptionKind.TooManyParameters, token: @operator, expression: context.Expression);
             }
-            else if (functionInfo.Name.Equals("case", StringComparison.OrdinalIgnoreCase) && function.Parameters.Count % 2 == 0)
-            {
-                throw new ParseException(ParseExceptionKind.EvenParameters, token: @operator, expression: context.Expression);
-            }
         }
 
         /// <summary>
@@ -416,12 +411,6 @@ namespace GitHub.Actions.Expressions
             String name,
             out IFunctionInfo functionInfo)
         {
-            if (String.Equals(name, "case", StringComparison.OrdinalIgnoreCase) && !context.AllowCaseFunction)
-            {
-                functionInfo = null;
-                return false;
-            }
-
             return ExpressionConstants.WellKnownFunctions.TryGetValue(name, out functionInfo) ||
                 context.ExtensionFunctions.TryGetValue(name, out functionInfo);
         }
@@ -429,7 +418,6 @@ namespace GitHub.Actions.Expressions
         private sealed class ParseContext
         {
             public Boolean AllowUnknownKeywords;
-            public Boolean AllowCaseFunction;
             public readonly String Expression;
             public readonly Dictionary<String, IFunctionInfo> ExtensionFunctions = new Dictionary<String, IFunctionInfo>(StringComparer.OrdinalIgnoreCase);
             public readonly Dictionary<String, INamedValueInfo> ExtensionNamedValues = new Dictionary<String, INamedValueInfo>(StringComparer.OrdinalIgnoreCase);
@@ -445,8 +433,7 @@ namespace GitHub.Actions.Expressions
                 ITraceWriter trace,
                 IEnumerable<INamedValueInfo> namedValues,
                 IEnumerable<IFunctionInfo> functions,
-                Boolean allowUnknownKeywords = false,
+                Boolean allowUnknownKeywords = false)
-                Boolean allowCaseFunction = true)
             {
                 Expression = expression ?? String.Empty;
                 if (Expression.Length > ExpressionConstants.MaxLength)
@@ -467,7 +454,6 @@ namespace GitHub.Actions.Expressions
 
                 LexicalAnalyzer = new LexicalAnalyzer(Expression);
                 AllowUnknownKeywords = allowUnknownKeywords;
-                AllowCaseFunction = allowCaseFunction;
             }
 
             private class NoOperationTraceWriter : ITraceWriter

src/Sdk/Expressions/ParseException.cs

@@ -29,9 +29,6 @@ namespace GitHub.Actions.Expressions
                 case ParseExceptionKind.TooManyParameters:
                     description = "Too many parameters supplied";
                     break;
-                case ParseExceptionKind.EvenParameters:
-                    description = "Even number of parameters supplied, requires an odd number of parameters";
-                    break;
                 case ParseExceptionKind.UnexpectedEndOfExpression:
                     description = "Unexpected end of expression";
                     break;

src/Sdk/Expressions/ParseExceptionKind.cs

@@ -6,7 +6,6 @@ namespace GitHub.Actions.Expressions
         ExceededMaxLength,
         TooFewParameters,
         TooManyParameters,
-        EvenParameters,
         UnexpectedEndOfExpression,
         UnexpectedSymbol,
         UnrecognizedFunction,

src/Sdk/Expressions/Sdk/Functions/Case.cs

@@ -1,45 +0,0 @@
-#nullable disable // Consider removing in the future to minimize likelihood of NullReferenceException; refer https://learn.microsoft.com/en-us/dotnet/csharp/nullable-references
-
-using System;
-using GitHub.Actions.Expressions.Data;
-
-namespace GitHub.Actions.Expressions.Sdk.Functions
-{
-    internal sealed class Case : Function
-    {
-        protected sealed override Object EvaluateCore(
-            EvaluationContext context,
-            out ResultMemory resultMemory)
-        {
-            resultMemory = null;
-            // Validate argument count - must be odd (pairs of predicate-result plus default)
-            if (Parameters.Count % 2 == 0)
-            {
-                throw new InvalidOperationException("case requires an odd number of arguments");
-            }
-
-            // Evaluate predicate-result pairs
-            for (var i = 0; i < Parameters.Count - 1; i += 2)
-            {
-                var predicate = Parameters[i].Evaluate(context);
-
-                // Predicate must be a boolean
-                if (predicate.Kind != ValueKind.Boolean)
-                {
-                    throw new InvalidOperationException("case predicate must evaluate to a boolean value");
-                }
-
-                // If predicate is true, return the corresponding result
-                if ((Boolean)predicate.Value)
-                {
-                    var result = Parameters[i + 1].Evaluate(context);
-                    return result.Value;
-                }
-            }
-
-            // No predicate matched, return default (last argument)
-            var defaultResult = Parameters[Parameters.Count - 1].Evaluate(context);
-            return defaultResult.Value;
-        }
-    }
-}

src/Sdk/WorkflowParser/Conversion/WorkflowTemplateConverter.cs

@@ -1775,7 +1775,7 @@ namespace GitHub.Actions.WorkflowParser.Conversion
             var node = default(ExpressionNode);
             try
             {
-                node = expressionParser.CreateTree(condition, null, namedValues, functions, allowCaseFunction: context.AllowCaseFunction) as ExpressionNode;
+                node = expressionParser.CreateTree(condition, null, namedValues, functions) as ExpressionNode;
             }
             catch (Exception ex)
             {

src/Sdk/WorkflowParser/ObjectTemplating/TemplateContext.cs

@@ -113,12 +113,6 @@ namespace GitHub.Actions.WorkflowParser.ObjectTemplating
         /// </summary>
         internal Boolean StrictJsonParsing { get; set; }
 
-        /// <summary>
-        /// Gets or sets a value indicating whether the case expression function is allowed.
-        /// Defaults to true. Set to false to disable the case function.
-        /// </summary>
-        internal Boolean AllowCaseFunction { get; set; } = true;
-
         internal ITraceWriter TraceWriter { get; set; }
 
         private IDictionary<String, Int32> FileIds

src/Sdk/WorkflowParser/ObjectTemplating/Tokens/TemplateToken.cs

@@ -55,7 +55,7 @@ namespace GitHub.Actions.WorkflowParser.ObjectTemplating.Tokens
             var originalBytes = context.Memory.CurrentBytes;
             try
             {
-                var tree = new ExpressionParser().CreateTree(expression, null, context.GetExpressionNamedValues(), context.ExpressionFunctions, allowCaseFunction: context.AllowCaseFunction);
+                var tree = new ExpressionParser().CreateTree(expression, null, context.GetExpressionNamedValues(), context.ExpressionFunctions);
                 var options = new EvaluationOptions
                 {
                     MaxMemory = context.Memory.MaxBytes,
@@ -93,7 +93,7 @@ namespace GitHub.Actions.WorkflowParser.ObjectTemplating.Tokens
             var originalBytes = context.Memory.CurrentBytes;
             try
             {
-                var tree = new ExpressionParser().CreateTree(expression, null, context.GetExpressionNamedValues(), context.ExpressionFunctions, allowCaseFunction: context.AllowCaseFunction);
+                var tree = new ExpressionParser().CreateTree(expression, null, context.GetExpressionNamedValues(), context.ExpressionFunctions);
                 var options = new EvaluationOptions
                 {
                     MaxMemory = context.Memory.MaxBytes,
@@ -123,7 +123,7 @@ namespace GitHub.Actions.WorkflowParser.ObjectTemplating.Tokens
             var originalBytes = context.Memory.CurrentBytes;
             try
             {
-                var tree = new ExpressionParser().CreateTree(expression, null, context.GetExpressionNamedValues(), context.ExpressionFunctions, allowCaseFunction: context.AllowCaseFunction);
+                var tree = new ExpressionParser().CreateTree(expression, null, context.GetExpressionNamedValues(), context.ExpressionFunctions);
                 var options = new EvaluationOptions
                 {
                     MaxMemory = context.Memory.MaxBytes,
@@ -153,7 +153,7 @@ namespace GitHub.Actions.WorkflowParser.ObjectTemplating.Tokens
             var originalBytes = context.Memory.CurrentBytes;
             try
             {
-                var tree = new ExpressionParser().CreateTree(expression, null, context.GetExpressionNamedValues(), context.ExpressionFunctions, allowCaseFunction: context.AllowCaseFunction);
+                var tree = new ExpressionParser().CreateTree(expression, null, context.GetExpressionNamedValues(), context.ExpressionFunctions);
                 var options = new EvaluationOptions
                 {
                     MaxMemory = context.Memory.MaxBytes,