name: Build and publish multiarch
on:
  push:
    branches:
      - master
      - java8-multiarch
      - java8-openj9
      - java11*
      - java16*
      - java17*
    tags:
      - "[0-9]+.[0-9]+.[0-9]+"
      - "[0-9]+.[0-9]+.[0-9]+-java8-multiarch"
      - "[0-9]+.[0-9]+.[0-9]+-java8-openj9"
      - "[0-9]+.[0-9]+.[0-9]+-java11*"
      - "[0-9]+.[0-9]+.[0-9]+-java16*"
    paths-ignore:
      - "*.md"
      - "docs/**"
      - "examples/**"

env:
  IMAGE_TO_TEST: itzg/minecraft-server:test-${{ github.repository_owner }}-${{ github.run_id }}

jobs:
  build:
    if: github.repository == 'itzg/docker-minecraft-server'
    runs-on: ubuntu-20.04
    steps:
      - name: Checkout
        uses: actions/checkout@v2.4.0

      - name: Docker meta
        id: meta
        uses: docker/metadata-action@v3
        with:
          images: |
            itzg/minecraft-server
          tags: |
            type=ref,event=branch
            type=ref,event=tag
          flavor: |
            latest=${{ github.event_name == 'push' && github.ref == 'refs/heads/master' }}

      - name: Setup Docker Buildx
        uses: docker/setup-buildx-action@v1

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v1.2.0

      - name: Login to DockerHub
        uses: docker/login-action@v1
        with:
          username: ${{ secrets.DOCKER_USER }}
          password: ${{ secrets.DOCKER_PASSWORD }}

      - name: Build for test
        uses: docker/build-push-action@v2.7.0
        if: github.ref_name == 'master'
        with:
          context: .
          platforms: linux/amd64
          tags: ${{ env.IMAGE_TO_TEST }}
          # ensure latest base image is used
          pull: true
          load: true
          push: false
          cache-from: type=gha
          # no cache-to to avoid cross-cache update from next build step

      - name: Run tests
        # It is assumed that image variants are merged from master and tested there
        if: github.ref_name == 'master'
        run: |
          tests/test.sh

      - name: Build and push
        id: docker_build
        uses: docker/build-push-action@v2.7.0
        with:
          context: .
          platforms: linux/amd64,linux/arm/v7,linux/arm64
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta.outputs.tags }}
          # ensure latest base image is used
          pull: true
          cache-from: type=gha
          cache-to: type=gha,mode=max
          labels: ${{ steps.meta.outputs.labels }}

      - name: Image digest
        run: echo ${{ steps.docker_build.outputs.digest }}