I personally host a forgejo instance on a private VPS ; so far almost no maintenance except protecting it from ai-crawlers[#1]. If you don't want the hassle, codeberg.org is a public instance of forgejo.

[#1]: https://her.esy.fun/posts/0031-how-i-protect-my-forgejo-inst...

I configure my local repositories to push on both Github and my forgejo instance. I am not using the CI much for my private projects (local tests are enough in my case).