Docs: preview on dev/docs branch as well. (#1159)

Signed-off-by: Tao He <[email protected]>

Author: sighingnow

.github/workflows/docs.yaml

@@ -19,9 +19,13 @@ on:
   push:
     branches:
       - main
+      - docs
+      - dev/docs
   pull_request_target:
     branches:
       - main
+      - docs
+      - dev/docs
 
 concurrency:
   group: ${{ github.repository }}-${{ github.event.number || github.head_ref || github.sha }}-${{ github.workflow }}