Comment by OneDeuxTriSeiGo

It's also worth noting that Gitea forked a while back. The community fork is Forgejo.

https://forgejo.org/

And if you really just want a simple hosting system, https://tangled.sh is really easy to set up. It uses atproto (network underlying bluesky) as their identity provider and for tracking issues, PRs, comments, etc. Their "knot server" is basically just a little self-hosted go node that manages git repos. The project is fairly small atm and it's pretty much all in go so it's not too hard to skim through if you want to see how it works under the hood (or if you are afraid of needing to be able to keep it maintained long term).