name: Publish Docker image
on:
  push:
    branches:
      - main

permissions:
  contents: read
  packages: write

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

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2

      - name: Log in to GitHub Container Registry
        uses: docker/login-action@v2
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Lowercase and set image tag
        run: echo "IMAGE_TAG=ghcr.io/$(echo $GITHUB_REPOSITORY | tr '[:upper:]' '[:lower:]'):latest" >> $GITHUB_ENV

      - name: Build and push Docker image
        uses: docker/build-push-action@v4
        with:
          context: .
          push: true
          tags: |
            ${{ env.IMAGE_TAG }}