{
  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11";
  outputs = { self, nixpkgs }: {
    nixosConfigurations = let
      sitesFiles = builtins.readDir ./sites;
      sitesNames = builtins.filter (name: builtins.pathExists ./sites/${name}/configuration.nix) (builtins.attrNames sitesFiles);
      configurations = builtins.listToAttrs (builtins.map (name: {inherit name; value = nixpkgs.lib.nixosSystem { modules = [ ./configuration.nix ./sites/${name}/configuration.nix ]; }; }) sitesNames);
      in configurations;
  };
}