ci-container-image.yml

name: container-image

on:
  push:
    branches: [ main ]
  pull_request:
    branches: [ main ]
  schedule:
    # Ideally, we would update the image every time the base image
    # (p4lang/behavioral-model) is updated, this is good enough.
    # "At minute 15 past every 4th hour from midnight through 23."
    - cron: '15 0-23/4 * * *'

# Cancel any preceding run on the pull request.
concurrency:
  group: container-image-${{ github.event.pull_request.number || github.ref }}
  cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}

jobs:
  build:
    if: ${{ github.repository == 'p4lang/p4c' }}
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v3
      with:
        submodules: recursive
    - name: Determine Docker image tag
      id: get-tag
      shell: bash
      run: |
        TAG=""
        if [[ "$GITHUB_REF" =~ "main" ]]; then
            TAG="latest"
        else
            TAG=${GITHUB_REF////_}
        fi
        echo "Tag is $TAG"
        echo "::set-output name=tag::$TAG"
    - name: Set up Docker Buildx
      uses: docker/setup-buildx-action@v2
    - name: Login to DockerHub
      if: ${{ github.event_name != 'pull_request' }}
      uses: docker/login-action@v2
      with:
        username: ${{ secrets.DOCKER_USERNAME }}
        password: ${{ secrets.DOCKER_PASSWORD }}
    - name: Build and push Docker image to registry
      uses: docker/build-push-action@v3
      with:
        context: .
        push: ${{ github.event_name != 'pull_request' }}
        tags: p4lang/p4c:${{ steps.get-tag.outputs.tag }}
        cache-from: type=gha
        cache-to: type=gha,mode=max