From a05bc408a46dbb3658854561389c64390493656e Mon Sep 17 00:00:00 2001
From: t8y2 <1156263951@qq.com>
Date: Mon, 13 Jul 2026 00:46:29 +0800
Subject: [PATCH] fix(ci): serialize mirror synchronization

---
 .github/workflows/sync-mirrors.yml | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/.github/workflows/sync-mirrors.yml b/.github/workflows/sync-mirrors.yml
index cad877d6c3..3dfd21e16a 100644
--- a/.github/workflows/sync-mirrors.yml
+++ b/.github/workflows/sync-mirrors.yml
@@ -9,6 +9,12 @@ on:
   delete:
   workflow_dispatch:
 
+# Mirror providers reject concurrent forced updates to the same ref. Serialize all
+# branch, tag, and delete events so rapid GitHub pushes cannot race each other.
+concurrency:
+  group: sync-mirrors
+  cancel-in-progress: false
+
 jobs:
   sync-cnb:
     name: Sync to CNB