I have created an empty git-ssb here ssb://%ojQGCYUpXg0KPz8y1ou+m6XzCz/89O26QepBrv8vKjM=.sha256. It would be most helpful with an overview of existing solutions. But please don't get too attached to any of them Overall it seems to me that the CI part is a simple problem, and we need a simple distributed offline solution that works well with our existing infrastructure.
And yes would be great if the CI had some notion of testing as well, but for this specific proposal I'll try to limit myself to benchmarking, but maybe if you're interesting that could be something for you to dig into? There are already plenty of tests for a large number of the components.
As for GitHub, while a lof of the scuttlebutt parts is developed there, we do try to cultivate our own git-ssb. @cel has a grant for improving things and have added comments to commits, which is super awesome.
The bots aspect and automation is really cool. @dinosaur added a framework for writing bots. I plan on looking into that.