name: Docker CI
on: push
env:
  DOCKER_BUILDKIT: 1
jobs:
  build:
    name: Build
    runs-on: ubuntu-18.04
    steps:
      - uses: actions/checkout@v1
      - name: Build dockerpi:vm
        run: docker build -t lukechilds/dockerpi:vm --target dockerpi-vm .
      - name: Build dockerpi
        run: docker build -t lukechilds/dockerpi:latest --target dockerpi .
      - name: Log image data
        run: docker images lukechilds/dockerpi
      - name: Save image tarballs
        run: |
          mkdir -p images
          images=$(docker images lukechilds/dockerpi --format "{{.Repository}}:{{.Tag}}")
          for image in $images; do
            docker save $image | gzip > "images/$(echo $image |  tr '/' '-').tgz"
          done
      - name: Print sha256sum of built image
        run: sha256sum images/*
      - name: Upload image tarballs
        uses: actions/upload-artifact@v1.0.0
        with:
          name: images
          path: images/
  publish:
    name: Publish
    if: github.ref == 'refs/heads/master'
    runs-on: ubuntu-18.04
    needs: build
    steps:
      - name: Download image tarballs
        uses: actions/download-artifact@v1.0.0
        with:
          name: images
      - name: Print sha256sum of all images
        run: sha256sum images/*
      - name: Load image tarballs
        run: for image in images/*; do docker load -i $image; done
      - name: Log image data
        run: docker images lukechilds/dockerpi
      - name: Login to Docker Hub
        run: echo "${{secrets.DOCKER_TOKEN}}" | docker login -u=lukechilds --password-stdin
      - name: Push to Docker Hub
        run: docker push lukechilds/dockerpi