name: Build & Push Docker Image

on:
  push:
    branches: [master]

env:
  REGISTRY: git.mischlabs.de

jobs:
  build-and-push:
    runs-on: ubuntu-latest
    defaults:
      run:
        shell: sh
    permissions:
      contents: read
      packages: write

    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Install Docker CLI
        run: |
          if command -v docker >/dev/null 2>&1; then
            docker --version
            exit 0
          fi

          if command -v apt-get >/dev/null 2>&1; then
            apt-get update
            apt-get install -y docker.io
          elif command -v apk >/dev/null 2>&1; then
            apk add --no-cache docker-cli
          else
            echo "No supported package manager found to install Docker CLI"
            exit 1
          fi

          docker --version

      - name: Check Docker daemon
        run: docker version

      - name: Log in to package registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

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

      - name: Lowercase image name
        run: echo "IMAGE_NAME=$(echo '${{ github.repository }}' | tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV

      - name: Build and push Docker image
        uses: docker/build-push-action@v5
        with:
          context: .
          push: true
          tags: |
            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.sha }}