refactor: switch from numtide/flake-utils to flake-parts

[drupol]

Since using numtide/flake-utils is getting controversial for many reasons, this PR uses flake-parts (https://github.com/hercules-ci/flake-parts).

[jtojnar]

Do you have a reference for the controversy?

To be honest, I am not really fond of switching to these opinionated flake helpers since they veer too far from how flakes work, making them harder to understand without looking at the implementation. Especially when there is so many of them, each slightly different.

[drupol]

I understand and I overall share the same feeling.

That said, from my thin experience with Nix flakes and Nix in general, I always found this a bit odd to require an external contrib package(numtide/flake-utils) to build a flake for different architectures.

As seen on Reddit, flake-parts is by default in Nix package and:

IMO, flake-parts has quite a bit better potential as well as being more useful today. NixOS-modules style option declaration and typing has much more opportunity for ergonomic and modular flake consumption.

Also, on Matrix, I often see people confirming those sayings.

I'm just proposing here, feel free to close if you don't like it.

[jtojnar]

Yeah, I am still not convinced. It would just be trading one flake input for another, still just to get a single mostly trivial function. (I did not even bother switching to flake-utils in my personal config when flake-utils became popular.) And while I like the API, it is still new and deviates from Flakes too much. Maybe we can re-evaluate later, perhaps when NixOS/nix#3843 moves along.

[drupol]

Ok, let's see how it goes!

[drupol]

Closing the PR in the meantime.