Update Dockerfile

Dockerfile

@@ -1,15 +1,18 @@
-FROM node:latest
+# Use the official Node.js 14 image.
+FROM node:14
 
-# Create app directory
+# Create and change to the app directory.
 WORKDIR /usr/src/app
 
-# Install app dependencies
-COPY package*.json ./
+# Copy application dependency manifests to the container image.
+COPY package.json ./
+COPY package-lock.json ./
+
+# Install production dependencies.
 RUN npm install
 
-# Bundle app source
-COPY . .
+# Copy local code to the container image.
+COPY . ./
 
-# Expose port and start application
-EXPOSE 8080
-CMD [ "node", "server.js" ]
+# Run the web service on container startup.
+CMD [ "npm", "server" ]