add: more complete shell.nix

[Ben-PH]

Disclaimer: changes made under the output of an LLM

Evidently my sysconfig is missing some things. compiling, i got this error:

➜ cargo run -p cuboid
error: rustc 1.91.1 is not supported by the following packages:
  wgpu@28.0.0 requires rustc 1.92
  wgpu@28.0.0 requires rustc 1.92
  wgpu@28.0.0 requires rustc 1.92
Either upgrade rustc or select compatible dependency versions with
`cargo update <name>@<current-ver> --precise <compatible-ver>`
where `<compatible-ver>` is the latest version supporting rustc 1.91.1

The fix was to add rustup to packages (including the local dir use)

I then had this error:

     Running `target/debug/cuboid`
Error: Error displaying model

Caused by:
    0: Error initializing event loop
    1: os error at /home/ben/rust/fornjot/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/winit-0.30.13/src/platform_impl/linux/mod.rs:788: Failed to load one of xlib's shared libraries

Which was fixed with the xorg additions to libpath

[hannobraun]

Thank you for this pull request!

I think this makes sense, as it makes the repository more accessible for other Nix users, while the previous version was only written to plug the holes in my personal setup.

The RUST_HOME/CARGO_HOME part doesn't work though. I'm not so sure it makes sense on principle, as every project that is set up like this will duplicate the same files instead of sharing them. If we wanted to do it like that, these directories would need to go into .gitignore though.

Disclaimer: changes made under the output of an LLM

Thank you, I appreciate the heads-up. Since this is a small and understandable change, I'll accept it.