On the php[architect] site they've shared a post from their most recent issue (June 2018 - Command and Control) from author Gabriel Zerbib covering self-hosting Git with Gitolite.

If you wish to set up a private Git server for your personal, work, or team projects, but favor free software and simple architecture, or don’t want a service hosted by a third party, then Gitolite is the solution for you.

The article starts with a brief history of Git and a listing of some of the options for hosting private Git repositories. It then gets into talking about Gitolite, a "collection of Perl scripts, wisely arranged to allow easy management of Git repositories served over the SSH protocol." He talks through some of the features that come along with the tool and how to get it installed. With that setup, he shows how to use it as a Git hosting platform, how to configure repositories, create and configure users, and perform backups. The post ends with some helpful troubleshooting tips and a look at Gitolite's hook system.