build-publish.yml

name: build-publish

on: [push]

jobs:
  build-and-test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Set up JDK 21
        uses: actions/setup-java@v4
        with:
          distribution: 'temurin'
          java-version: 21

      - name: Build with Maven
        run: mvn package --batch-mode --no-transfer-progress

  publish-to-gh-container-registry:
    needs: build-and-test
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v4

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Install pack CLI via the official buildpack Action https://github.com/buildpacks/github-actions#setup-pack-cli-action
        uses: buildpacks/github-actions/setup-pack@v5.8.5

      # Caching Paketo Build see https://stackoverflow.com/a/66598693/4964553
      # BP_OCI_SOURCE as --env creates the GitHub Container Registry <-> Repository link (https://paketo.io/docs/buildpacks/configuration/#applying-custom-labels)
      # BP_JVM_VERSION 16, because we use Java 16 inside our Maven build but Paketo defaults to 11
      - name: Build app with pack CLI & publish to bc Container Registry
        run: |
          pack build ghcr.io/jonashackt/microservice-api-spring-boot:latest \
              --builder paketobuildpacks/builder-jammy-base \
              --path . \
              --env "BP_OCI_SOURCE=https://github.com/jonashackt/microservice-api-spring-boot" \
              --env "BP_JVM_VERSION=21" \
              --cache-image ghcr.io/jonashackt/microservice-api-spring-boot-paketo-cache-image:latest \
              --publish