name: Docker

on:
  push:
    branches: [ main ]
  pull_request:
    branches: [ main ]

env:
  TEST_TAG: rails-on-docker:test

jobs:
  build-and-test-image:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v2

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2

      - name: Build and push
        uses: docker/build-push-action@v3
        with:
          context: .
          file: ./production.Dockerfile
          push: false
          load: true
          tags: ${{ env.TEST_TAG }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

      - name: Inspect
        run: |
          docker image inspect ${{ env.TEST_TAG }}

      - name: Test
        run: |
          docker run --rm --env SECRET_KEY_BASE=dummy ${{ env.TEST_TAG }}