ci: remove ubuntu 18.04 image (#980)

* ci: remove Ubuntu 18.04 runner

Co-authored-by: toast-gear <toast-gear@users.noreply.github.com>

.github/renovate.json5

@@ -13,12 +13,11 @@
     {
       // use https://github.com/actions/runner/releases
       "fileMatch": [
-        ".github/workflows/ubuntu-18-04-runners.yml",
-        ".github/workflows/ubuntu-20-04-runners.yml"
+        ".github/workflows/runners.yml"
         ],
       "matchStrings": ["RUNNER_VERSION: +(?<currentValue>.*?)\\n"],
       "depNameTemplate": "actions/runner",
       "datasourceTemplate": "github-releases"
     }
   ]
-}
+}

.github/workflows/runners.yml

@@ -1,4 +1,4 @@
-name: Ubuntu 20.04 Runners
+name: Runners
 
 on:
   pull_request:
@@ -11,9 +11,8 @@ on:
       - 'master'
     paths:
       - 'runner/**'
-      - .github/workflows/ubuntu-20-04-runners.yml
+      - .github/workflows/runners.yml
       - '!**.md'
-      - '!runner/Dockerfile.ubuntu.1804'
 
 env:
   RUNNER_VERSION: 2.285.0
@@ -23,15 +22,17 @@ env:
 jobs:
   build:
     runs-on: ubuntu-latest
-    name: Build ${{ matrix.name }}-ubuntu-${{ matrix.os-version }}
+    name: Build ${{ matrix.name }}-${{ matrix.os-name }}-${{ matrix.os-version }}
     strategy:
       fail-fast: false
       matrix:
         include:
           - name: actions-runner
+            os-name: ubuntu
             os-version: 20.04
             dockerfile: Dockerfile
           - name: actions-runner-dind
+            os-name: ubuntu
             os-version: 20.04
             dockerfile: Dockerfile.dindrunner
 
@@ -57,8 +58,8 @@ jobs:
             RUNNER_VERSION=${{ env.RUNNER_VERSION }}
             DOCKER_VERSION=${{ env.DOCKER_VERSION }}
           tags: |
-            ${{ env.DOCKERHUB_USERNAME }}/${{ matrix.name }}:v${{ env.RUNNER_VERSION }}-ubuntu-${{ matrix.os-version }}
-            ${{ env.DOCKERHUB_USERNAME }}/${{ matrix.name }}:v${{ env.RUNNER_VERSION }}-ubuntu-${{ matrix.os-version }}-${{ steps.vars.outputs.sha_short }}
+            ${{ env.DOCKERHUB_USERNAME }}/${{ matrix.name }}:v${{ env.RUNNER_VERSION }}-${{ matrix.os-name }}-${{ matrix.os-version }}
+            ${{ env.DOCKERHUB_USERNAME }}/${{ matrix.name }}:v${{ env.RUNNER_VERSION }}-${{ matrix.os-name }}-${{ matrix.os-version }}-${{ steps.vars.outputs.sha_short }}
             ${{ env.DOCKERHUB_USERNAME }}/${{ matrix.name }}:latest
           cache-from: type=gha
           cache-to: type=gha,mode=max

.github/workflows/ubuntu-18-04-runners.yml

@@ -1,61 +0,0 @@
-name: Ubuntu 18.04 Runners
-
-on:
-  pull_request:
-    types: 
-      - opened
-      - synchronize
-      - reopened
-      - closed
-    branches:
-      - 'master'
-    paths:
-      - 'runner/**'
-      - .github/workflows/ubuntu-18-04-runners.yml
-      - '!**.md'
-      - '!runner/Dockerfile'
-      - '!runner/Dockerfile.dindrunner'
-
-env:
-  RUNNER_VERSION: 2.284.0
-  DOCKER_VERSION: 20.10.8
-  DOCKERHUB_USERNAME: summerwind
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    name: Build ${{ matrix.name }}-ubuntu-${{ matrix.os-version }}
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          - name: actions-runner
-            os-version: 18.04
-            dockerfile: Dockerfile.ubuntu.1804
-
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-
-      - name: Setup Docker Environment
-        id: vars
-        uses: ./.github/actions/setup-docker-environment
-        with: 
-          username: ${{ secrets.DOCKER_USER }}
-          password: ${{ secrets.DOCKER_ACCESS_TOKEN }}
-
-      - name: Build and Push Versioned Tags
-        uses: docker/build-push-action@v2
-        with:
-          context: ./runner
-          file: ./runner/${{ matrix.dockerfile }}
-          platforms: linux/amd64,linux/arm64
-          push: ${{ github.ref == 'master' && github.event.pull_request.merged == true }}
-          build-args: |
-            RUNNER_VERSION=${{ env.RUNNER_VERSION }}
-            DOCKER_VERSION=${{ env.DOCKER_VERSION }}
-          tags: |
-            ${{ env.DOCKERHUB_USERNAME }}/${{ matrix.name }}:v${{ env.RUNNER_VERSION }}-ubuntu-${{ matrix.os-version }}
-            ${{ env.DOCKERHUB_USERNAME }}/${{ matrix.name }}:v${{ env.RUNNER_VERSION }}-ubuntu-${{ matrix.os-version }}-${{ steps.vars.outputs.sha_short }}
-          cache-from: type=gha
-          cache-to: type=gha,mode=max