Not sure how much sense that makes, but happy to be wrong…
Git is already well integrated with SSH and PGP, so adding Nostr keys as a separate thing might be odd/annoying.
Using existing git send-mail https://git-send-email.io/ could work using nostr instead of email as the communication layer… Git also needs a place to store stuff, which nostr isn’t great at
I had high hopes for sr.ht but founder is rabidly anti-Bitcoin and crypto so I expec there will be further “can’t do that here” rulings to come. Still, it’s open-source so a good thing to fork
(/rant)