fix: remove Nginx default site if it exists to prevent conflicts

setup_build_server.sh

@@ -117,6 +117,12 @@ server {
 EOL
 
 ln -sf $NGINX_SITE /etc/nginx/sites-enabled/
+
+DEFAULT_SITE="/etc/nginx/sites-enabled/default"
+if [ -L "$DEFAULT_SITE" ] || [ -f "$DEFAULT_SITE" ]; then
+    echo "==> Entferne Nginx Default-Site"
+    sudo rm -f "$DEFAULT_SITE"
+fi
 nginx -t
 systemctl restart nginx