Seconding radicale, I’ve been using it for over a year and it’s been rock solid. I can’t say the same about NextCloud, it seemed to break every update and was slow as hell. I moved to SyncThing and never looked back.

Codeberg doesn’t have much compute available for CI runners, and asks that you use the runners they do have sparingly. If you’re into the self-hosting thing, you can run the Forgejo runner, which has the same workflow syntax as GitHub Actions, or you can run something like Woodpecker CI, which has its own workflow syntax. I’ve had better luck running Woodpecker myself and I have it running jobs for all my projects as well as a Renovate bot that runs every hour.