Opposed to this

See #24860 for prior arguments

Nix user here, I think @mockersf has some points. WE could easily put the flake under tools/build-nix or something alike

Also:

• the flake could also include other dev tolls like the typos bin
• does the flake support wasm builds?
• editing LD_LIBRARY_PATH is not recommended, using rpath is better

Otherwise I like the idea of having it in the repo since you also have a point. As a nix user it's hard to find out which dependencies are needed to compile vanilla bevy with all features enabled.

On the other hand: someone also has to maintain this, so it might be nice to have a small survey about how many people would actually use it.