name: Docker

on:
    - pull_request

jobs:
    build:
        name: Test Docker image build
        runs-on: ubuntu-20.04

        steps:
            - name: Checkout PR branch
              uses: actions/checkout@v2

            - name: Lint Dockerfiles with Hadolint
              run: |
                  # Install latest Hadolint binary from GitHub (not available via apt)
                  HADOLINT_LATEST_TAG=$(curl --silent "https://api.github.com/repos/hadolint/hadolint/releases/latest" | jq -r .tag_name)
                  sudo curl -sLo /usr/bin/hadolint "https://github.com/hadolint/hadolint/releases/download/$HADOLINT_LATEST_TAG/hadolint-Linux-x86_64"
                  sudo chmod +x /usr/bin/hadolint
                  hadolint **Dockerfile

            - name: Set up QEMU
              uses: docker/setup-qemu-action@v1

            - name: Set up Docker Buildx
              uses: docker/setup-buildx-action@v1

            - name: Build
              id: docker_build
              uses: docker/build-push-action@v2
              with:
                  push: false
                  tags: posthog/posthog:latest

            - name: Image digest
              run: echo ${{ steps.docker_build.outputs.digest }}