Add run on_push. (#3862)

* add commit when manually triggered

* add trigger from main

---------

Co-authored-by: Jack He <jackhe@microsoft.com>

.github/workflows/publish-docfx.yml

@@ -6,7 +6,7 @@ on:
   # Runs on pushes targeting the default branch
   push:
     branches: ["main"]
-    paths: ["docs/**"]
+    paths: ["docs/**", ".github/workflows/publish-docfx.yml"]
 
   pull_request:
     branches: ["main"]