How do you install this by declaring it in your nixos config?

[sebbelindholm]

Might be a stupid question but I want to try this out but wants to have a 100% reproducible setup.

[Aylur]

you can use the flake

# in your flake
inputs.ags.url = "github:Aylur/ags";

outputs = { nixpkgs, ... }@inputs:
{
    nixosConfigurations."hostname" = nixpkgs.lib.nixosSystem {
        specialArgs = { inherit inputs; }; # pass inputs as specialArg
        modules = [ /path-to/configuration.nix ]; # your config
    };
}

# in configuration.nix
{ pkgs, inputs, ... }:
{
  environment.systemPackages = [
    inputs.ags.packages.${pkgs.system}.default # add it to your environment
  ];
}

you can also checkout my config to see how I have set it up on home-manager