docker.yml

name: Docker image

on:
  push:
    branches: [ master ]
  release:
    types: [ prereleased, released ]

jobs:
  validate_gradle_wrapper:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - uses: gradle/wrapper-validation-action@v1
  test:
    needs: [ validate_gradle_wrapper ]
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - name: Set up JDK 11
        uses: actions/setup-java@v3
        with:
          java-version: '11'
          distribution: 'temurin'
      - name: Cache Gradle packages
        uses: actions/cache@v3
        with:
          path: ~/.gradle/caches
          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}
          restore-keys: ${{ runner.os }}-gradle
      - name: Run Java tests
        uses: gradle/gradle-build-action@v2
        with:
          arguments: testAggregateTestReport
      - name: Persist aggregated test reports on failure
        if: ${{ failure() }}
        uses: actions/upload-artifact@v3
        with:
          name: Test report - Java
          path: build/reports/tests/unit-test/aggregated-results/

  build_push:
    needs: test
    name: Build and push Docker image
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
        with:
          fetch-depth: 0 # need full clone so `./gradlew currentVersion` can search parents for older tags when needed
      - name: Set up JDK 11
        uses: actions/setup-java@v3
        with:
          java-version: '11'
          distribution: 'temurin'
      - name: Cache Gradle packages
        uses: actions/cache@v3
        with:
          path: ~/.gradle/caches
          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}
          restore-keys: ${{ runner.os }}-gradle
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2
      - name: Login to GitHub Container Registry
        uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Initialize Gradle
        run: |
          # The first time gradlew is invoked it downloads gradle and outputs progress about that to STDOUT.
          # This "dummy" invokation gets that out of the way so future gradlew commands have clean output
          ./gradlew --version
      - name: Prepare version metadata
        id: prep
        run: |
          # ghcr.io path should match current repo but be all lowercase
          DOCKER_IMAGE=ghcr.io/${GITHUB_REPOSITORY,,}
          echo "Set DOCKER_IMAGE=${DOCKER_IMAGE}"

          # delegate to axion-release-plugin to generate version string from Git repository state
          echo "Detecting version with ./gradlew currentVersion"
          AXION_VERSION="$(./gradlew currentVersion -q -Prelease.quiet)"
          echo "Set AXION_VERSION=${AXION_VERSION}"

          # determine docker tags
          if [[ "${GITHUB_EVENT_NAME}" == "release" ]]; then
            # tag releases with version determined by axion-release-plugin
            DOCKER_TAGS="${DOCKER_IMAGE}:${AXION_VERSION}"
          else
            # tag pushes to master as "latest"
            DOCKER_TAGS="${DOCKER_IMAGE}:latest"
          fi
          echo "Set DOCKER_TAGS=${DOCKER_TAGS}"

          echo "version=${AXION_VERSION}" >> $GITHUB_OUTPUT
          echo "tags=${DOCKER_TAGS}" >> $GITHUB_OUTPUT
          echo "created=$(date -u +'%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_OUTPUT

      # Build and push steps are split up in order to test the built contaire image in between
      # - build-args and labels inputs _must_ be kept matching between both to prevent rebuild
      # - See: https://github.com/docker/build-push-action/blob/master/docs/advanced/test-before-push.md
      - name: Build Docker container image
        uses: docker/build-push-action@v3
        with:
          context: .
          file: ./Dockerfile
          build-args: |
            VERSION_TAG=${{ steps.prep.outputs.version }}
          load: true
          tags: ${{ steps.prep.outputs.tags }}
          labels: |
            org.opencontainers.image.source=https://github.com/${GITHUB_REPOSITORY,,}.git
            org.opencontainers.image.created=${{ steps.prep.outputs.created }}
            org.opencontainers.image.revision=${{ github.sha }}
            org.opencontainers.image.version=${{ steps.prep.outputs.version }}
      - name: Test Docker container image
        run: docker run --rm ${{ steps.prep.outputs.tags }} --help
      - name: Push Docker container image
        uses: docker/build-push-action@v3
        with:
          context: .
          file: ./Dockerfile
          build-args: |
            VERSION_TAG=${{ steps.prep.outputs.version }}
          push: true
          tags: ${{ steps.prep.outputs.tags }}
          labels: |
            org.opencontainers.image.source=https://github.com/${GITHUB_REPOSITORY,,}.git
            org.opencontainers.image.created=${{ steps.prep.outputs.created }}
            org.opencontainers.image.revision=${{ github.sha }}
            org.opencontainers.image.version=${{ steps.prep.outputs.version }}