nice! I built one of these too and the thing that made it most useful was a GitHub action that other repos could use. You should put that on your backlog.
this looks great, but can't test, the .deb package is broken with an issue about NODE_MODULE_VERSION mismatches. There seems to be a PR waiting for approval. Will keep an eye on it.
nice! I made github.com/frostyard/plow last week with a serverless take on this (just for debian repos though). Being served by gh-pages means no git-lfs support though. repogen might be a better option if any packages get too big.