Lots of different options, hosted and self hosted.
Github actions and GitLab are two of the more common ones, the latter is self hosted but the former is the dominant one if CV skills is needed
Do note that Github Actions have been the target of like 50 different attacks and I would not combine publicly hosted code with your own runners, as without proper sandboxing it can lead to anybody executing any code on your machine just by opening a PR (might have been fixed since last I heard, but the general vibe stands).