docker-autobuild-nginx.yml

name: Docker Image Build - Nginx
on:
  # build when push to main or release happens
  push:
    branches:
      - main
      - release

  # allow manual execution
  workflow_dispatch:

permissions:
  contents: read
  packages: write

env:
  REGISTRY: ghcr.io
  COMPONENT: nginx

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

      - name: Log in to the Container registry
        uses: docker/login-action@v2
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v3
        with:
          images: ${{ env.REGISTRY }}/${{ github.repository }}
          # tag with latest-${{ env.COMPONENT }} (only on default branch)
          #          <branch>-${{ env.COMPONENT }}
          #          <pr #>-${{ env.COMPONENT }}
          #          <hash>-${{ env.COMPONENT }}
          #          <git tag>-${{ env.COMPONENT }}
          #          prod-${{ env.COMPONENT }}    IF branch == release
          #          staging-${{ env.COMPONET }}  IF branch == main
          tags: |
            type=ref,event=branch,suffix=-${{ env.COMPONENT }}
            type=ref,event=tag,suffix=-${{ env.COMPONENT }}
            type=ref,event=pr,suffix=-${{ env.COMPONENT }}
            type=sha,format=long,suffix=-${{ env.COMPONENT }}
            type=raw,value=latest,suffix=-${{ env.COMPONENT }},priority=900,enable={{is_default_branch}}
            type=raw,value=staging,suffix=-${{ env.COMPONENT }},priority=1000,enable=${{ github.ref == format('refs/heads/{0}', 'main') }}
            type=raw,value=prod,suffix=-${{ env.COMPONENT }},priority=1000,enable=${{ github.ref == format('refs/heads/{0}', 'release') }}

      - name: Build and push Docker image
        uses: docker/build-push-action@v3
        with:
          context: .
          file: "Dockerfile.nginx"
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}