.github: exclude .git directory in rsync --delete op

Signed-off-by: Joachim Wiberg <[email protected]>

Author: troglobit

.github/workflows/docs.yml

@@ -77,7 +77,7 @@ jobs:
 
       - name: Sync site to pages repo
         run: |
-          rsync -a --delete site/ pages/
+          rsync -a --delete --exclude .git site/ pages/
 
       - name: Commit and push
         run: |