Update Dockerfile

Dockerfile

@@ -1,31 +1,45 @@
-# for deploying a React application with Node.js in a Docker container
+# === Stage 1: Build ===
+# Create a build environment
+FROM node:22-alpine AS builder
 
-# Use Node 22 as the base image
-FROM node:22-alpine
-
-# Set the working directory inside the container
+# Set working directory
 WORKDIR /app
 
-# Copy package.json and package-lock.json (if you have one)
+# Copy package files and install ALL dependencies (including devDependencies)
 COPY package*.json ./
-
-# Install dependencies
 RUN npm install
 
-# Copy the rest of the application code
+# Copy the rest of the source code
 COPY . .
 
-# Expose the port your React app runs on
+# Build the application
+# Use --no-cache to ensure a clean build
+RUN npm run build --no-cache
+
+# === Stage 2: Production ===
+# Create a final, lean production image
+FROM node:22-alpine
+
+# Set working directory
+WORKDIR /app
+
+# Install ONLY production dependencies
+COPY package*.json ./
+RUN npm install --omit=dev
+
+# Copy assets and build output from the builder stage
+COPY --from=builder /app/public ./public
+COPY --from=builder /app/.next ./.next
+COPY --from=builder /app/next.config.mjs ./next.config.mjs
+
+# Expose the port
 EXPOSE 7860
 
-# Change ownership of /app to the node user
+# Change ownership to the node user for security
 RUN chown -R node:node /app
 
-# Switch to the node user
+# Switch to the non-root user
 USER node
 
-# Command to build the application
-CMD ["npm", "run", "build"]
-
-# Command to run the application
+# The command to start the application
 CMD ["npm", "run", "start"]