* multi-stage Dockerfile
* add build arguments for git
* add taskfile
* switch back to copying source into build stage and clean up labels
* get image name from .env
* remove top level ARGs
* update DOCKER-README with Taskfile details
* mention light and safe image
* add a backup task
* add healthcheck
* add logs-folder task
* add warnings to backup task
* allow port overriding in docker compose
