I have this exact issue and have ling considered some tagging based system for my images but never got around to it. Sounds cool!

Cloud sync is fine with me, but required cloud sync is so annoying when i download an app for local testing and it forces a login before i can even use it. Definitely interested

This is a much better thought out version of a project I made by necessity last year using github actions. It was for batching PRs when maintaining related open source repos as they grew, I especially like the ability to run on a local repo- gh actions made that very difficult and I suffered as a result haha Thanks for sharing!