ci(docs[trigger]): Temporarily add gp-sphinx branch to docs trigger

why: Testing gp-sphinx 0.0.1a0 packages in live docs environment.

Author: tony

.github/workflows/docs.yml

@@ -4,6 +4,7 @@ on:
   push:
     branches:
       - master
+      - gp-sphinx
 
 permissions:
   contents: read