I know this isn't super helpful, but I built my own bors-style CI bot over a few weekends, and I'm very satisfied with it. It looks for PR comments with a speci

I know this isn't super helpful, but I built my own bors-style CI bot over a few weekends, and I'm very satisfied with it. It looks for PR comments with a specific keyword, then pulls the branch, tests it, and pushes a merge commit automatically. Taking this approach has two big upsides. First, the bot is just a binary running on a cheap VPS; so I know that it'll be fast and that I can ssh in at any time to debug if necessary. Second, if there's a feature that I want, I can just add it, rather than twiddling my thumbs. For example, I noticed that I was manually deleting my merged PR branches every time, so I added a few lines to the bot and now it deletes them automatically. The obvious downsides of this approach are: 1) Implementing even an MVP of such a bot can consume significant time and energy, which you may not have a lot of; 2) If there's a bug, it's your fault and now you need to spend more time and energy tracking it down; and 3) Your bot might have a security vulnerability that exposes secrets, allows injection attacks, etc. I'd love to see tooling/frameworks that make it easier to create custom CI systems. I think startups (and perhaps larger companies as well) could benefit a lot from building a CI in-house, since it allows you to optimize for your own specific needs. I see a lot of parallels to code linters, where spending a bit of time writing custom lint rules or static analysis tools can have a large payoff.