It would be really handy if you could link this repository's Dockerfile to an 'official' repo on Docker Hub. That way people wanting to install with Docker can just download pre-generated images without needing to manually clone and build, and the hub will automatically rebuild and push out updates when things change here on GitHub.
The process involves linking your Docker and GitHub accounts so they can add a webhook, so only a repository admin can do it. Once it's setup though, it's more or less automatic.