ci: update docs build workflow trigger

Author: Aetherinox

.github/workflows/documentation.yml

@@ -27,6 +27,10 @@ on:
   release:
     types:
       - published
+  push:
+    branches:
+      - main
+      - master
   workflow_dispatch:
   schedule:
     - cron: "0 */12 * * *"