Merge pull request #131814 from blaggacao/fix-nix-daemon-registry-type-unspecified-error

nixos/nix-daemon: fix registry flake type

nixos/modules/services/misc/nix-daemon.nix

···
                 description = "The flake reference to which <option>from></option> is to be rewritten.";
               };
               flake = mkOption {
-                type = types.unspecified;
+                type = types.nullOr types.attrs;
                 default = null;
                 example = literalExample "nixpkgs";
                 description = ''