Adopt nixos-generators

[viluon]

nixos-generators, something like the following

{
  inputs = {
    nixpkgs.url = "nixpkgs/nixos-23.11";
    nixos-generators = {
      url = "github:nix-community/nixos-generators";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };
  outputs = { self, nixpkgs, nixos-generators, ... }: {
    packages.x86_64-linux = {
      qemu = nixos-generators.nixosGenerate {
        system = "x86_64-linux";
        modules = [
          ./configuration.nix
        ];

        # qcow2 for qemu
        format = "qcow";

        # optional arguments:
        # explicit nixpkgs and lib:
        # pkgs = nixpkgs.legacyPackages.x86_64-linux;
        # lib = nixpkgs.legacyPackages.x86_64-linux.lib;
        # additional arguments to pass to modules:
        # specialArgs = { myExtraArg = "foobar"; };

        # you can also define your own custom formats
        # customFormats = { "myFormat" = <myFormatModule>; ... };
        # format = "myFormat";
      };
      # vbox = nixos-generators.nixosGenerate {
      #   system = "x86_64-linux";
      #   format = "virtualbox";
      # };
    };
  };
}

[viluon]

See also live USBs with flakes.