3 actually.
by @DanConwayDev
mine is way less ambitious, but check it out:
GitWorkshop.dev
Decentralized github alternative over Nostr
GitHub
GitHub - gugabfigueiredo/git-remote-nostr: a git remote helper to work with nostr remote urls
a git remote helper to work with nostr remote urls - gugabfigueiredo/git-remote-nostr