A few people are but there is a better way:

Use gitea which almost has feature parity : https://about.gitea.com/

Or gogs if you want something more lightweight.

Then use nostr for updates.

You can host it at git.blowater.app its quite easy.

A good thing to work on is login to gitea with nostr, a couple of people are working on this too, single sign on

An alternative is radicle, but many are put off by their token sale, from the past

Git over nostr is neat, and there are some heroic efforts, but it'll never be feature parity, and also relays are not guaranteed to store data, only to relay notes, and other stuff.