This looks pretty cool. I haven't had a chance to try it out myself but have looked over your docs. I've seen a few others create similar systems but they are usually hacked together for a single purpose. My only suggestion would be in terms of distribution. Providing a PPA/repository for deb and rpm packages would be great. Offering the service as a docker container would be easier and more universal. Creating a simple way for someone to deploy this to their stack would make it even better.

While your GIT installation method is simple and straightforward for most it does require installation of git on the target system and doesn't support automatic updates (which could be needed if an issue is reported).