build-image.yml

name: Image build

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

env:
  IMAGE_NAME: kroegen
  # Cannot use 'github.repository_owner' because it is not lowercase
  REPO_OWNER: schuttejan

jobs:
  build:
    runs-on: ubuntu-latest
    permissions:
      packages: write
      contents: read
    steps:
      # https://docs.github.com/en/packages/managing-github-packages-using-github-actions-workflows/publishing-and-installing-a-package-with-github-actions
      - uses: actions/checkout@v4
      - name: Build the image
        run: docker build . --file Dockerfile --tag $IMAGE_NAME --label "runnumber=${GITHUB_RUN_ID}"
      - name: Log in to registry
        if: github.ref == 'refs/heads/main'
        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u ${{ github.actor }} --password-stdin
      - name: Push image
        if: github.ref == 'refs/heads/main'
        run: |
          IMAGE_ID=ghcr.io/$REPO_OWNER/$IMAGE_NAME
          VERSION=$(echo "${{ github.ref }}" | sed -e 's,.*/\(.*\),\1,')
          [[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION | sed -e 's/^v//')
          [ "$VERSION" == "main" ] && VERSION=latest
          echo IMAGE_ID=$IMAGE_ID
          echo VERSION=$VERSION
          docker tag $IMAGE_NAME $IMAGE_ID:$VERSION
          docker push $IMAGE_ID:$VERSION