name: Publish PR Docker Image
on:
  repository_dispatch:
    types: [test-server-command]
jobs:
  docker:
    runs-on: ubuntu-latest
    steps:
      - name: Dump the client payload context
        env:
          PAYLOAD_CONTEXT: ${{ toJson(github.event.client_payload) }}
        run: echo "$PAYLOAD_CONTEXT"
      - name: Checkout
        uses: actions/checkout@v2
        with:
          ref: ${{ github.event.client_payload.pull_request.head.sha }}
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v1
      - name: Set variables
        id: prep
        run: |
          DOCKER_IMAGE=test-server
          REPOSITORY="$(echo $GITHUB_REPOSITORY | tr '[:upper:]' '[:lower:]')" # Repository name must be lowercase in image tags
          TAGS="ghcr.io/${REPOSITORY}/${DOCKER_IMAGE}:${{ github.event.client_payload.pull_request.head.sha }}"
          echo ::set-output name=tags::${TAGS}
      - name: Log in to GitHub Docker Registry
        uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Build container image
        uses: docker/build-push-action@v2
        with:
          context: .
          push: true
          tags: ${{ steps.prep.outputs.tags }} #