main.yml

name: CI

on:
  push:
    branches:
      - main

env:
  IMAGE_NAME: "debug-container"
  REGISTRY: "ghcr.io"

jobs:
  build_and_push:
    runs-on: ubuntu-latest
    if: github.event_name == 'push'
    permissions:
      contents: read
      packages: write

    steps:
      - uses: actions/checkout@v4

      - name: Build image
        run: docker buildx build . --tag $IMAGE_NAME

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v3
        with:
         registry: ${{ env.REGISTRY }}
         username: ${{ github.actor }}
         password: ${{ secrets.GITHUB_TOKEN }}

      - name: Push image
        run: |
          IMAGE_ID=ghcr.io/${{ github.repository_owner }}/$IMAGE_NAME

          ## Change all uppercase to lowercase
          IMAGE_ID=$(echo $IMAGE_ID | tr '[A-Z]' '[a-z]')
          
          ## Strip git ref prefix from version
          VERSION=$(echo "${{ github.ref }}" | sed -e 's,.*/\(.*\),\1,')

          ## Strip "v" prefix from tag name
          [[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION | sed -e 's/^v//')

          ## Use Docker `latest` tag convention
          [ "$VERSION" == "main" ] && VERSION=latest

          echo IMAGE_ID=$IMAGE_ID
          echo VERSION=$VERSION

          docker tag $IMAGE_NAME $IMAGE_ID:$VERSION
          docker push $IMAGE_ID:$VERSION