fix NVM_DIR

Dockerfile

@@ -17,6 +17,7 @@ RUN apt update && apt install -y \
 
 # Install nvm (Node Version Manager) and then use it to install Node.js and npm
 # This ensures a clean and controlled Node.js/npm environment
+RUN mkdir -p /nvm
 ENV NVM_DIR /nvm
 ENV NODE_VERSION 20.17.0
 # Specify a compatible Node.js version, matching the earlier error message's requirement