[flake] nix run .#en doesn't work

flake.nix

@@ -94,6 +94,16 @@
 
           packages.en = mkSpacyDerivation "en";
           packages.fr = mkSpacyDerivation "fr" ;
+
+          apps.en = flake-utils.lib.mkApp {
+            drv = pkgs.writeShellApplication {
+              name = "spacy-en";
+              text = ''
+                set -x
+                ${(server (langMap."en"))}/bin/startServer.sh
+              '';
+            };
+          };
         }
     );
 }