Generate Scaffolder OpenAPI server

Signed-off-by: solimant <solimant@users.noreply.github.com>

packages/backend-openapi-utils/src/types/generated.ts

@@ -21,7 +21,12 @@ import { PathTemplate, ValueOf } from './common';
  */
 export type EndpointMap = Record<
   string,
-  { query?: object; body?: object; response?: object | void; path?: object }
+  {
+    query?: object;
+    body?: object;
+    response?: object | string | void;
+    path?: object;
+  }
 >;
 
 // OpenAPI generator doesn't emit regular lowercase 'delete'.