name: Build Docker image
on:
  push:
    branches: [master]
  pull_request:
    branches: ["*"]

env:
  REGISTRY: ghcr.io

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v2

      - name: Log in to the Container registry
        uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Construct tags / labels for an image
        id: meta
        uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
        with:
          images: |
            ${{ env.REGISTRY }}/${{ github.repository }}
          tags: |
            type=sha

      # https://docs.github.com/en/actions/learn-github-actions/workflow-commands-for-github-actions#setting-an-environment-variable
      - name: Update environment variables
        run: grep -v '^#' .env >> $GITHUB_ENV

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

      - name: Build and push Docker image
        uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
        with:
          push: ${{ github.event_name == 'push' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          build-args: |
            OTP_VERSION=${{ env.OTP_VERSION }}
            THRIFT_VERSION=${{ env.THRIFT_VERSION }}
            SERVICE_NAME=${{ env.SERVICE_NAME }}