I self host Forgejo on a cheap VPS with hourly borg backups to rsync.net. It's a great system and seems comparable to github, although I'm not a heavy user of actions on either platform. I do use the container registry though. It was a smooth transition and easy to install. I used the docker installation method. Forgejo is great if you don't mind hosting yourself.

You may consider dsci as its ci is baked in and it uses general programming languages directly as the first class citizens