update inventory implementation

nixosModules/clanCore/inventory/interface.nix

@@ -0,0 +1,36 @@
+{ lib, ... }:
+let
+  # {
+  #   roles = {
+  #     client = {
+  #       machines = [
+  #         "camina_machine"
+  #         "vi_machine"
+  #       ];
+  #     };
+  #     server = {
+  #       machines = [ "vyr_machine" ];
+  #     };
+  #   };
+  # }
+  instanceOptions = lib.types.submodule {
+    options.roles = lib.mkOption { type = lib.types.attrsOf machinesList; };
+  };
+
+  # {
+  #   machines = [
+  #     "camina_machine"
+  #     "vi_machine"
+  #     "vyr_machine"
+  #   ];
+  # }
+  machinesList = lib.types.submodule {
+    options.machines = lib.mkOption { type = lib.types.listOf lib.types.str; };
+  };
+in
+{
+  # clan.inventory.${moduleName}.${instanceName} = { ... }
+  options.clan.inventory = lib.mkOption {
+    type = lib.types.attrsOf (lib.types.attrsOf instanceOptions);
+  };
+}