docker_publish.yml

name: Build & Publish Docker Images

on:
  push:
    branches: [ 'main' ]
  pull_request:

env:
  REGISTRY: ghcr.io

jobs:
  calculate-images-to-build:
    name: Calculate Images To Build
    runs-on: ubuntu-latest
    outputs:
      changed_dirs: ${{ steps.filter_config_directories.outputs.changed_dirs }}
    steps:
      - name: "Checkout repository"
        uses: actions/checkout@v4
      - name: "Calculate changed files directories"
        id: calculate_changed_files
        uses: tj-actions/changed-files@v44
        with:
          dir_names: true
          dir_names_exclude_current_dir: true
          json: true
      - name: "Filter out config directories"
        id: filter_config_directories
        run: |
          CHANGED_DIRS=$(echo "${{ steps.calculate_changed_files.outputs.all_changed_files }}" | jq -c '[.[] | select(. |  contains(".") | not)'])
          echo "changed_dirs=$CHANGED_DIRS" >> "$GITHUB_OUTPUT"
  build-and-push-image:
    runs-on: ubuntu-latest
    # Sets the permissions granted to the `GITHUB_TOKEN` for the actions in this job.
    permissions:
      contents: read
      packages: write
      attestations: write
      id-token: write
    needs:
      - calculate-images-to-build
    strategy:
      matrix:
        changed_dir: ${{ fromJSON(needs.calculate-images-to-build.outputs.changed_dirs ) }}
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
      - name: Log in to the Container Registry
        uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Extract Details From config.yml
        id: extract_from_config_yaml
        run: |
          echo "desired_version=$(cat ${{ github.workspace }}/${{ matrix.changed_dir }}/config.yml | yq '.version')" >> "$GITHUB_OUTPUT"
          echo "platforms=$(cat ${{ github.workspace }}/${{ matrix.changed_dir }}/config.yml | yq '.platforms | join(",")')" >> "$GITHUB_OUTPUT"
      - name: Check Image to Build Does Not Already Exist
        run: |
          if docker manifest inspect ${{ env.REGISTRY }}/${{ matrix.changed_dir }}:${{ steps.extract_from_config_yaml.outputs.desired_version }} > /dev/null; then
            echo "The tag "${{ env.REGISTRY }}/${{ matrix.changed_dir }}:${{ steps.extract_from_config_yaml.outputs.desired_version }}" already exists in the repository. Do you need to bump the version in the config.yml?"
            exit 1
          fi
      - name: Calculate Version
        id: calculate_version
        run: |
          VERSION=${{ github.event_name == 'pull_request' && format('{0}-PR{1}.{2}', steps.extract_from_config_yaml.outputs.desired_version, github.event.number, github.event.pull_request.head.sha) || steps.extract_from_config_yaml.outputs.desired_version}}
          echo "version=$VERSION" >> "$GITHUB_OUTPUT"
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3
      - name: Get Docker Metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ matrix.changed_dir }}
          tags: |
            type=semver,pattern={{version}},value=v${{ steps.calculate_version.outputs.version }}
            type=sha
      - name: Build and Push Docker image
        id: push
        uses: docker/build-push-action@v6
        with:
          context: ${{ github.workspace }}/${{ matrix.changed_dir }}
          file: ${{ github.workspace }}/${{ matrix.changed_dir }}/Dockerfile
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          platforms: ${{ steps.extract_from_config_yaml.outputs.platforms }}
      - name: Generate artifact attestation
        uses: actions/attest-build-provenance@v1
        with:
          subject-name: ${{ env.REGISTRY }}/${{ matrix.changed_dir }}
          subject-digest: ${{ steps.push.outputs.digest }}
          push-to-registry: true
      - name: Create Git Tag
        if: ${{ github.event_name != 'pull_request' }}
        uses: mathieudutour/github-tag-action@v6.2
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}
          default_bump: false
          default_prerelease_bump: false
          custom_tag: ${{ matrix.changed_dir }}/v${{ steps.calculate_version.outputs.version }}
      - name: Create GitHub Releas
        if: ${{ github.event_name != 'pull_request' }}
        uses: comnoco/create-release-action@v2.0.5
        with:
          tag_name: ${{ matrix.changed_dir }}/v${{ steps.calculate_version.outputs.version }}
          release_name: ${{ matrix.changed_dir }} - v${{ steps.calculate_version.outputs.version }}