ClanModules: make all module available to inventory

lib/inventory/build-inventory/default.nix

@@ -135,6 +135,8 @@ let
               in
               if builtins.pathExists path then
                 path
+              else if role == "default" then
+                { }
               else
                 throw "Module doesn't have role: '${role}'. Path: ${path} not found."
             ) inverseRoles.${machineName} or [ ];

lib/inventory/interface-to-schema.nix

@@ -96,7 +96,7 @@ let
         let
           roles = getRoles self.clanModules.${moduleName};
         in
-        if roles == null then [ ] else roles;
+        if roles == null then [ "default" ] else roles;
       moduleServices = lib.mapAttrs moduleToService (
         lib.filterAttrs (n: _v: rolesOf n != [ ]) modulesSchema
       );