What you just described is Fossil. It has an auto-sync feature that makes everything feel distributed.

Just set up a Kubernetes deployment and you’re set.

But as others mention, GitHub’s primary strength is collaboration. If you want decentralized, solve this by creating a decentralized collaboration tool on top of fossil and/or git.

For example, how to do pull requests and code reviews?

Why they just described is Git :) pretty sure it was a joke