name: Docker build & push image

on:
  push:
    branches: [v4]
  workflow_dispatch:

jobs:
  docker:
    runs-on: ubuntu-latest
    steps:
      - name: Set lowercase repository owner environment variable
        run: |
          echo "OWNER_LOWERCASE=${OWNER,,}" >>${GITHUB_ENV}
        env:
          OWNER: "${{ github.repository_owner }}"

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Login to DockerHub
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ env.OWNER_LOWERCASE }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Build and push
        uses: docker/build-push-action@v5
        with:
          push: true
          tags: ghcr.io/${{ env.OWNER_LOWERCASE }}/quartz:latest