fix(deploy): exclude content/.indiekit/ from rsync --delete

This directory is managed by the node jail, not by the build. rsync
was trying to delete homepage.json (placed by the other jail) and
failing with permission denied.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/deploy.yml

@@ -116,6 +116,7 @@ jobs:
           ssh-keyscan -p 222 ${{ secrets.SSH_HOST }} >> ~/.ssh/known_hosts 2>/dev/null
           cp .env _site/.env
           rsync -rlz --delete \
+            --exclude='content/.indiekit/' \
             -e "ssh -p 222" \
             _site/ \
             ${{ secrets.SSH_USER }}@${{ secrets.SSH_HOST }}:/usr/local/bastille/jails/web/root/usr/local/www/blog/