Good evening!
I'm at Open Source Summit atm, and ZenDiS has presented their following project: https://badges.opencode.de/en/
This is limited to their OpenCode repository, but otherwise seems extremely close to what this project is trying to achieve.
I believe that we should take a close look at ZenDiS badges before continuing with this project in its current state.
Their code is, of course, fully open source: https://gitlab.opencode.de/open-code/badgebackend