Improve flake

[TornaxO7]

this makes the flake.nix file a bit more readable in my opinion :)

The changes are:

• Replacing flake-utils with flake-parts because flake-parts is "syntax-friendlier"
• making use of oxalica/rust-overlay in order to load the given rust-toolchain
• added weekly CI to keep flake.lock up to date
• I'd also volunteer to maintain the flake.nix
• updated flake.lock with nix flake update

@Toqozz

[TornaxO7]

Hm.. actually... I'm rethinking this a bit.

[Toqozz]

Thanks!

I'd love for any of the other nix contributors to have a look at this since I don't use nix personally. @SignalWalker

If nobody gets to this within a week I'll try to take a look myself. Could you briefly explain the improvements?

[TornaxO7]

Could you briefly explain the improvements?

• (Subjective improvement): Switching from flake-utils to flake-parts which has a cleaner structure for multiple systems
• updated the flake.lock with nix flake update (you can't currently run cargo check because it's version is too old)
• added rust-overlay so the nix-dev-shells are loading the tools from the given rust-toolchain.toml

[SignalWalker]

Looks good to me, though you might want to keep Alejandra or get some other formatter.

[TornaxO7]

though you might want to keep Alejandra or get some other formatter.

Fixed, I added the nixpkgs-fmt :)

[Toqozz]

Awesome, thanks so much you guys.

[TornaxO7]