nixos/open-webui: quote services.open-webui.host in start script (#378244)

nixos/modules/services/misc/open-webui.nix

@@ -97,7 +97,7 @@ in
       } // cfg.environment;
 
       serviceConfig = {
-        ExecStart = "${lib.getExe cfg.package} serve --host ${cfg.host} --port ${toString cfg.port}";
+        ExecStart = "${lib.getExe cfg.package} serve --host \"${cfg.host}\" --port ${toString cfg.port}";
         EnvironmentFile = lib.optional (cfg.environmentFile != null) cfg.environmentFile;
         WorkingDirectory = cfg.stateDir;
         StateDirectory = "open-webui";

nixos/tests/open-webui.nix

@@ -15,6 +15,7 @@ in
       {
         services.open-webui = {
           enable = true;
+          host = "";
           environment = {
             # Requires network connection
             RAG_EMBEDDING_MODEL = "";