Nix in CI seems like a really excellent match. I don’t care much about the ATproto space - but Tangled has built their CI system on Nix and I find that really compelling. CI Caching is just awful with GitHub actions - so it made me disappointed that Forgejo went that route.

This is exactly why I made https://nix-ci.com/ And it supports Forgejo, GitHub, and GitLab.

I use https://garnix.io/ for all my Nix CI, works great.