name: Build Docker Image
on: [push, pull_request]
jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Set up Checkout
        uses: actions/checkout@v2
      - name: Install Buildx and QEMU
        run: |
          export DOCKER_BUILDKIT=1
          docker build --platform=local -o . git://github.com/docker/buildx
          mkdir -p ~/.docker/cli-plugins
          mv buildx ~/.docker/cli-plugins/docker-buildx
          docker run --rm --privileged multiarch/qemu-user-static:latest --reset -p yes --credential yes
          docker buildx create --use --name build --node build --driver-opt network=host
      - name: Build Docker image
        env:
          DOCKER_USERNAME: ${{ github.actor }}
          DOCKER_IMAGE_PLATFORM: linux/amd64,linux/arm/v7,linux/arm64
          REPOSITORY_NAME: ${{ github.repository }}
        run: |
          IFS='/' read -ra repository_name_array <<<"$REPOSITORY_NAME"
          DOCKER_IMAGE_NAME=$(echo $DOCKER_USERNAME/${repository_name_array[1]} | tr '[:upper:]' '[:lower:]')
          docker buildx build \
            --platform "$DOCKER_IMAGE_PLATFORM" \
            --output "type=image,push=false" \
            --tag "$DOCKER_IMAGE_NAME":latest \
            --file ./Dockerfile .