If you really think that's all it is, I would encourage you to write your own.

It would be silly to write a new one today. Plenty of open source + indy options to invest into instead.

For scheduled work, cron + a log sink is fine, and for pull request CI there's plenty of alternatives that don't charge by the minute to use your own hardware. The irony here, unfortunately, is that the latter requires I move entirely off of GitHub now.