name: Publish Canary Images

# Revert to https://github.com/actions-runner-controller/releases#releases
# for details on why we use this approach
on:
  push:
    branches:
      - master
    paths-ignore:
      - '**.md'
      - '.github/actions/**'
      - '.github/ISSUE_TEMPLATE/**'
      - '.github/workflows/e2e-test-dispatch-workflow.yaml'
      - '.github/workflows/gha-e2e-tests.yaml'
      - '.github/workflows/arc-publish.yaml'
      - '.github/workflows/arc-publish-chart.yaml'
      - '.github/workflows/gha-publish-chart.yaml'
      - '.github/workflows/arc-release-runners.yaml'
      - '.github/workflows/global-run-codeql.yaml'
      - '.github/workflows/global-run-first-interaction.yaml'
      - '.github/workflows/global-run-stale.yaml'
      - '.github/workflows/arc-update-runners-scheduled.yaml'
      - '.github/workflows/validate-arc.yaml'
      - '.github/workflows/arc-validate-chart.yaml'
      - '.github/workflows/gha-validate-chart.yaml'
      - '.github/workflows/arc-validate-runners.yaml'
      - '.github/dependabot.yml'
      - '.github/RELEASE_NOTE_TEMPLATE.md'
      - 'runner/**'
      - '.gitignore'
      - 'PROJECT'
      - 'LICENSE'
      - 'Makefile'

# https://docs.github.com/en/rest/overview/permissions-required-for-github-apps
permissions:
  contents: read
  packages: write

concurrency:
  group: ${{ github.workflow }}
  cancel-in-progress: true

env:
  # Safeguard to prevent pushing images to registeries after build
  PUSH_TO_REGISTRIES: true

jobs:
  canary-build:
    name: Build and Publish gha-runner-scale-set-controller Canary Image
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v2
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      # Normalization is needed because upper case characters are not allowed in the repository name
      # and the short sha is needed for image tagging
      - name: Resolve parameters
        id: resolve_parameters
        run: |
          echo "INFO: Resolving short sha"
          echo "short_sha=$(git rev-parse --short ${{ github.ref }})" >> $GITHUB_OUTPUT
          echo "INFO: Normalizing repository name (lowercase)"
          echo "repository_owner=$(echo ${{ github.repository_owner }} | tr '[:upper:]' '[:lower:]')" >> $GITHUB_OUTPUT

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v2

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2
        with:
          version: latest

      # Unstable builds - run at your own risk
      - name: Build and Push
        uses: docker/build-push-action@v3
        with:
          context: .
          file: ./Dockerfile
          platforms: linux/amd64,linux/arm64
          build-args: VERSION=canary-${{ steps.resolve_parameters.outputs.short_sha }}
          push: ${{ env.PUSH_TO_REGISTRIES }}
          tags: |
            ghcr.io/${{ steps.resolve_parameters.outputs.repository_owner }}/gha-runner-scale-set-controller:canary
            ghcr.io/${{ steps.resolve_parameters.outputs.repository_owner }}/gha-runner-scale-set-controller:canary-${{ steps.resolve_parameters.outputs.short_sha }}
          cache-from: type=gha
          cache-to: type=gha,mode=max