ci(sync-schedule): add manual trigger for sync workflow

- add workflow_dispatch event to enable manual execution

.github/workflows/sync-schedule.yml

@@ -3,6 +3,7 @@ name: 同步仓库到其它远程仓库(定时任务)
 on:
   schedule:
     - cron: 0 */1 * * *
+  workflow_dispatch:
 
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