update build docs action permissions

Author: puredanger

.github/workflows/build_docs.yml

@@ -1,7 +1,7 @@
 name: Build Docs
 
 permissions:
-  contents: read
+  contents: write
 
 on:
   workflow_dispatch:
@@ -48,4 +48,4 @@ jobs:
           git config --global user.email "clojure-build@users.noreply.github.com"
           git add -u -v
           git commit -m "Action doc commit"
-          git push origin master
+          git push origin master