Update Dockerfile

Dockerfile

@@ -1,4 +1,16 @@
 FROM ubuntu:latest
 
+# Set environment variables for Node.js installation
+ENV NODE_VERSION=21
+
+# Update package lists
+RUN apt-get update && apt-get install -y curl
+
+# Add Node.js repository
+RUN curl -fsSL https://deb.nodesource.com/setup_${NODE_VERSION}.x | bash -
+
+# Install Node.js
+RUN apt-get install -y nodejs
+
 CMD npm install
 CMD npm start