first version

Dockerfile

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+# Use an official Node.js runtime as a parent image
+# Alpine Linux is chosen for its small size
+FROM node:20-alpine
+
+# Set the working directory in the container
+WORKDIR /app
+
+# Copy package.json and package-lock.json (if available)
+COPY package*.json ./
+
+# Install app dependencies using npm ci for faster, reliable builds
+# Use --only=production to avoid installing devDependencies
+RUN npm ci --only=production
+
+# Copy the rest of the application code
+COPY . .
+
+# Make port 3000 available to the world outside this container
+# This is the port our Node.js app will listen on
+EXPOSE 3000
+
+# Define the command to run your app using CMD which defines your runtime
+CMD [ "node", "server.js" ]