client: exit with error on errors

src/client/commands/create_user.rs

@@ -107,5 +107,9 @@ pub async fn create_users(
 
     server_connection.send(Request::Exit).await?;
 
+    if result.values().any(|res| res.is_err()) {
+        std::process::exit(1);
+    }
+
     Ok(())
 }