Replace usages of cargoLock with cargoHash

[oidro]

While investigating my system flake's evaluation time I noticed that removing nixos-cosmic caused a considerable speedup—through some searching I found NixOS/nixpkgs#327063, which led me to believe that the usage of cargoLock across the packages in this repository was the culprit.

After converting all of the packages to use cargoHash via the script linked in NixOS/nixpkgs#357257, my evaluation time dropped by 6 seconds, as evidenced by hyperfine:

Before:

Benchmark 1: nix eval '.#nixosConfigurations."desktop".config.system.build.toplevel' --no-eval-cache --impure
  Time (mean ± σ):     17.984 s ±  0.130 s    [User: 13.300 s, System: 1.888 s]
  Range (min … max):   17.869 s … 18.126 s    3 runs

After:

Benchmark 1: nix eval '.#nixosConfigurations."desktop".config.system.build.toplevel' --no-eval-cache --impure
  Time (mean ± σ):     12.115 s ±  0.115 s    [User: 9.270 s, System: 1.286 s]
  Range (min … max):   12.013 s … 12.239 s    3 runs

I ran nix build on a couple of the packages to make sure nothing was obviously broken, and they built fine, but I lack the processing power to check all of them 😅

Also, I am not sure if any changes would have to be made to the CI or Cachix action as a result of this, it looks like they can handle cargoHash though!

[drakon64]

Currently the new useFetchCargoVendor requires NixOS/nixpkgs#282798 to be merged otherwise a lot of builds are going to fail.

Also, useFetchCargoVendor isn't available in 24.11 yet. I'm pretty sure there was a PR to backport it though. I was wrong, NixOS/nixpkgs#362288 has been backported.

[drakon64]

Actually, I can attempt a build against this branch

https://github.com/drakon64/nixos-cosmic/actions/runs/12340727082