fix error

nix/flakeModule.nix

@@ -27,13 +27,19 @@ in
       default = pkgs: pkgs.prettier;
       description = "The formatter function to use for formatting sops file";
     };
-    nixosModule = mkOption {
-      type = types.deferredModule;
-      readOnly = true;
-      description = "NixOS module configuration for managing sops secrets.";
+    nixosModule = {
+      default = mkOption {
+        type = types.functionTo types.attrs;
+        default = host: { };
+        description = "A function that takes a hostname and returns a NixOS module to apply to that host.";
+      };
+      network = mkOption {
+        type = types.functionTo types.attrs;
+        default = { config, ... }: { };
+        description = "A function that takes the NixOS configuration and returns a NixOS module to apply to the host based on its network configuration.";
+      };
     };
   };
-
   config =
     let
       secrets = builtins.fromJSON (builtins.readFile "${inputs.self}/${cfg.secretsDir}/secrets.json");