name: Docker build

on:
  - push
  - pull_request

jobs:
  docker:
    runs-on: ubuntu-18.04
    steps:
      - name: Checkout code
        uses: actions/checkout@v2
        with:
          fetch-depth: 0

      # https://github.com/docker/build-push-action
      - name: Build Docker image
        uses: docker/build-push-action@v2
        with:
          context: .
          tags: jupyter/repo2docker:pr
          push: false

      - name: Run repo2docker Docker image
        run: docker run jupyter/repo2docker:pr repo2docker --version