Add nixos-generators

[nagy]

https://github.com/nix-community/nixos-generators

[zimbatm]

Hi, I believe this entry doesn't satisfy the utility point of the inclusion policy: https://github.com/NixOS/flake-registry#inclusion-policy . But let me know if I missed some arguments.

[nagy]

The main purpose of this PR is that people can always run nix run nixos-generators instead of nix run github:nix-community/nixos-generators, so its main purpose is only a shortcut.

The shortcut must offer clear utility to the NixOS ecosystem; it is not intended to showcase random projects.

I would argue, that the project resides in the nix-community org implies already that it has some utility for the NixOS ecosystem.

Common names should be avoided to prevent confusion...

nixos-generators seems pretty unique and explicit to me.

Feel free to close if you dont agree.

[akirak]

The main purpose of this PR is that people can always run nix run nixos-generators instead of nix run github:nix-community/nixos-generators, so its main purpose is only a shortcut.

@nagy FYI, you can use nix run nixpkgs#nixos-generators for that, with slightly more typing. The advantage of having a registry entry would be allowing to access nixosModules and nixosGenerate from inside a flake without adding an input. Apologies if you already know this.