build.yml

name: Create and publish a Docker image

on:
  push:
    branches: ['master']

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build-and-push-image:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
      - name: Set up JDK 17
        uses: actions/setup-java@v4
        with:
          java-version: '17'
          distribution: 'temurin'
          cache: maven
      - name: App version
        run: |
          echo "app_ver=$(mvn -B help:evaluate -Dexpression=project.version -q -DforceStdout)"
          echo "app_ver=$(mvn -B help:evaluate -Dexpression=project.version -q -DforceStdout)" >> $GITHUB_ENV
      - name: Build with Maven
        run: mvn -B clean integration-test package assembly:single
      - name: Copy artifacts
        run: |
          cp target/kafdrop-*.tar.gz target/docker-ready
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3
      - 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: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
      - name: Build and push Docker image
        uses: docker/build-push-action@v5
        with:
          context: target/docker-ready
          push: true
          pull: true
          platforms: linux/amd64,linux/arm64
          provenance: false
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}