ci(workflows): add workflow_dispatch event (#1044)

Because

- `workflow_dispatch` is useful to manually trigger to generate `v0-dev`
component documentation

This commit

- add the event

Author: pinglin

.github/workflows/sync-component-docs.yml

@@ -1,7 +1,7 @@
 name: Sync component docs
 
 on:
-  workflow_call:
+  workflow_dispatch:
   push:
     branches:
       - main