build-docker-and-push.yml

name: Build Docker and push

on:
  push:
    branches:
      - main
    tags:
      - '*'

  pull_request:

env:
  REGISTRY: ghcr.io
  IMAGE: ${{ github.repository }}
  TAG: ${{ format('main-{0}', github.event.pull_request.head.sha || github.sha) }}

jobs:
  build_and_push_docker:
    if: ${{ !startsWith(github.ref, 'refs/tags/') }}
    permissions:
      contents: read
      packages: write

    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Set docker image env var
        run: |
          echo "DOCKER_IMAGE=${REGISTRY}/${IMAGE}:${TAG}" >> $GITHUB_ENV

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

      - name: 'Login to GitHub Container Registry'
        uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{github.actor}}
          password: ${{secrets.GITHUB_TOKEN}}

      - name: Setup Gradle
        uses: gradle/actions/setup-gradle@v3

      - name: Build with Gradle
        run: ./gradlew clean bootJar jibDockerBuild --image=${{ env.DOCKER_IMAGE }} --build-cache --info

      - name: Docker push
        run: |
          docker tag ${{env.DOCKER_IMAGE}} ${{env.REGISTRY}}/${{env.IMAGE}}:${{ env.TAG }}-gh${{ github.run_id }}
          docker tag ${{env.DOCKER_IMAGE}} ${{env.REGISTRY}}/${{env.IMAGE}}:latest
          docker push ${{env.REGISTRY}}/${{env.IMAGE}} --all-tags

  retag_docker:
    if: ${{ startsWith(github.ref, 'refs/tags/') }}
    permissions:
      contents: read
      packages: write
    runs-on: ubuntu-latest
    steps:
      - name: Set docker image env var
        run: |
          echo "DOCKER_IMAGE=${REGISTRY}/${IMAGE}:${TAG}" >> $GITHUB_ENV

      - name: 'Login to GitHub Container Registry'
        uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{github.actor}}
          password: ${{secrets.GITHUB_TOKEN}}

      - name: Re-tag docker
        run: |
          docker pull ${{env.DOCKER_IMAGE}}
          docker tag ${{env.DOCKER_IMAGE}} ${{env.REGISTRY}}/${{env.IMAGE}}:${{ github.ref_name }}
          docker push ${{env.REGISTRY}}/${{env.IMAGE}} --all-tags