publish.yml

name: Publish package to GitHub Packages
on:
  push:
    branches:
      - main
  pull_request:

env:
  IMAGE_NAME: action
  REGISTRY: ghcr.io

jobs:
  test-image:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3.3.0
      - name: Check that the image builds
        run: docker build . --file Dockerfile
  validate-action:
    runs-on: ubuntu-latest
    if: github.event_name == 'pull_request'
    steps:
      - uses: actions/checkout@v3.3.0
      # This checks that .github/workflows/review-bot.yml is pointing towards the main branch
      # as, during development, we change this to use the code from the test branch and
      # we may forget to set it back to main
      - name: Validate that action points to main branch
        run: |
          BRANCH=$(yq '.jobs.updatePullRequests.steps[0].uses' $FILE_NAME | cut -d "@" -f2)
          # If the branch is not the main branch
          if [ "$BRANCH" != "$GITHUB_BASE_REF" ]; then
            echo "Action points to $BRANCH. It has to point to $GITHUB_BASE_REF instead!"
            exit 1
          else
            echo "Action is correctly pointing to $GITHUB_BASE_REF"
          fi
        env:
          FILE_NAME: ".github/workflows/up-to-date.yml"

  compare-versions:
    runs-on: ubuntu-latest
    outputs:
      version: ${{ steps.verification.outputs.VERSION }}
      exists: ${{ steps.checkTag.outputs.exists }}
    steps:
      - uses: actions/checkout@v3.3.0
      - name: Extract package.json version
        id: package_version
        run: echo "VERSION=$(jq '.version' -r package.json)" >> $GITHUB_OUTPUT
        # Compare that the versions contain the same name
      - name: Compare versions
        id: verification
        uses: Bullrich/compare-version-on-action@main
        with:
          version: ${{ steps.package_version.outputs.VERSION }}
        # Verifies if there is a tag with that version number
      - uses: mukunku/tag-exists-action@v1.4.0
        if: steps.verification.outputs.VERSION
        id: checkTag
        with: 
          tag: v${{ steps.package_version.outputs.VERSION }}

  publish:
    if: github.event_name == 'push' && needs.compare-versions.outputs.exists == 'false'
    needs: [test-image, compare-versions]
    runs-on: ubuntu-latest
    permissions:
      contents: write
      packages: write
    steps:
      - uses: actions/checkout@v3.3.0
      - name: Tag version and create release
        run: gh release create $VERSION --generate-notes
        env:
          VERSION: v${{ needs.compare-versions.outputs.version }}
          GH_TOKEN: ${{ github.token }}
      - name: Log in to the Container registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ github.repository }}/${{ env.IMAGE_NAME }}
          tags: ${{ needs.compare-versions.outputs.version }}
      - uses: actions/checkout@v3
      - name: Build and push Docker image
        uses: docker/build-push-action@v5
        with:
          context: .
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}