name: "Docker Multiarch Build & Push"

on:
  push:
    branches: [master]

env:
  DOCKER_HUB_USER: matrixdotorg

jobs:
  BuildAndPush:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2

      - name: Set up buildx
        uses: crazy-max/ghaction-docker-buildx@v1
        with:
          buildx-version: latest

      - name: Log in to registry
        run: echo "${{ secrets.DOCKER_TOKEN }}" | docker login -u $(echo "$DOCKER_HUB_USER") --password-stdin

      - name: Build and push
        run: |
          # Build temporary builder image first and then use it to build monolith and polylith images
          for suffix in '' 'monolith' 'polylith'; do
            # Name of the repo/image
            IMAGE_NAME=$DOCKER_HUB_USER/dendrite$(if [ $suffix != "" ]; then echo "-$suffix"; fi)
            
            # Strip git ref prefix from version
            VERSION=$(echo "${{ github.ref }}" | sed -e 's,.*/\(.*\),\1,')
            
            # Use `latest` insted of `master`
            [ "$VERSION" == "master" ] && VERSION=latest
            
            # Ensure the whole tag is lowercase
            IMAGE_NAME=$(echo $IMAGE_NAME | tr '[A-Z]' '[a-z]')

            echo IMAGE_NAME=$IMAGE_NAME
            echo VERSION=$VERSION

            docker buildx build --push \
               --file build/docker/Dockerfile$(if [ $suffix != "" ]; then echo ".$suffix"; fi) \
               --tag $IMAGE_NAME:$VERSION \
               --platform linux/amd64,linux/arm/v7,linux/arm64 .
          done