diff --git a/gitea_runner_node/Dockerfile b/gitea_runner_node/Dockerfile
index da1dddb..b092867 100644
--- a/gitea_runner_node/Dockerfile
+++ b/gitea_runner_node/Dockerfile
@@ -17,19 +17,5 @@ RUN npm install -g n \
     && n install 22 \
     && n use 20 \
     && npm install -g yarn pnpm \
-    && (cat <<'EOF' > /usr/local/bin/use-node
-#!/bin/bash
-case "$1" in
-    18|20|22)
-        n use "$1" > /dev/null 2>&1
-        export PATH="/usr/local/n/versions/node/$1/bin:${PATH}"
-        echo "Switched to Node.js $1: $(node -v)"
-        ;;
-    *)
-        echo "Usage: source use-node [18|20|22]"
-        return 1
-        ;;
-esac
-EOF
-) \
+    && printf '#!/bin/bash\ncase "$1" in\n    18|20|22)\n        n use "$1" > /dev/null 2>&1\n        export PATH="/usr/local/n/versions/node/$1/bin:${PATH}"\n        echo "Switched to Node.js $1: $(node -v)"\n        ;;\n    *)\n        echo "Usage: source use-node [18|20|22]"\n        return 1\n        ;;\nesac\n' > /usr/local/bin/use-node \
     && chmod +x /usr/local/bin/use-node