gollum/.github/workflows/docker-test.yml

name: Build and Test Docker
on: [push, pull_request]
env:
  CI_IMAGE: gollum-ci-img
jobs:
  build-and-test:
    runs-on: ubuntu-latest
    steps:
      - name: Check Out Repo
        uses: actions/checkout@v2
      - name: Set up Docker Buildx
        id: buildx
        uses: docker/setup-buildx-action@v1
      - name: Cache docker layers
        uses: actions/cache@v2
        with:
          path: /tmp/.buildx-cache
          key: ${{ runner.os }}-buildx-${{ github.sha }}
          restore-keys: |
            ${{ runner.os }}-buildx-
      - name: Build
        id: docker_build
        uses: docker/build-push-action@v2
        with:
          context: ./
          file: ./Dockerfile
          builder: ${{ steps.buildx.outputs.name }}
          push: false
          tags: ${{ env.CI_IMAGE }}
          outputs: type=docker
          cache-from: type=local,src=/tmp/.buildx-cache
          cache-to: type=local,dest=/tmp/.buildx-cache
      - name: Image digest
        run: echo ${{ steps.docker_build.outputs.digest }}
      - name: docker state
        run: docker image ls
      - name: Run tests
        run: docker run -e CI=true -w /app --entrypoint bundle ${{ env.CI_IMAGE }} exec rake