docker-image.yml

name: Build default "Maintenance Page" container

on:
  push:
    branches: [ "1.x" ]

jobs:

  build:
    runs-on: ubuntu-latest
    env:
      REGISTRY: ghcr.io
      CONTAINER_NAME: ${{ github.repository }}/nginx-maintenance-page
      BASE_TAG: ${{ vars.NGINX_CONTAINER_TAG }}
      BUILD_PLATFORMS: linux/amd64,linux/arm64

    steps:
    - uses: actions/checkout@v3
    - uses: docker/setup-qemu-action@v2
    - uses: docker/setup-buildx-action@v2

    - name: Log into registry
      if: github.event_name != 'pull_request'
      uses: docker/login-action@v2
      with:
        registry: ${{ env.REGISTRY }}
        username: ${{ github.actor }}
        password: ${{ secrets.GITHUB_TOKEN }}

    - name: Extract container metadata
      id: meta
      uses: docker/metadata-action@v4
      with:
        images: "${{ env.REGISTRY }}/${{ env.CONTAINER_NAME }}"

    - name: Build and push Docker image
      id: build-and-push
      uses: docker/build-push-action@v4
      with:
        context: maintenance-page/
        file: ${{ steps.dockerfile.outputs.filename }}
        build-args: |
          BASE_TAG=${{ env.BASE_TAG }}
        push: ${{ github.event_name != 'pull_request' }}
        tags: ${{ steps.meta.outputs.tags }}
        labels: ${{ steps.meta.outputs.labels }}
        platforms: ${{ env.BUILD_PLATFORMS }}
        # GitHub Actions Caches
        # https://docs.docker.com/build/cache/backends/gha/#using-dockerbuild-push-action
        cache-from: type=gha
        cache-to: type=gha,mode=max