update readme

Dockerfile

@@ -1,16 +1,24 @@
-# Use an official Node.js runtime as a parent image
+# Use an official Node.js image
 FROM node:20
 
-# Set the working directory in the container
+# Create and set the working directory
 WORKDIR /app
 
-COPY package*.json ./
-
-# Install dependencies
+# Copy package.json and install dependencies
+COPY package.json package-lock.json ./
 RUN yarn install
 
-# Copy the rest of the application code into the container
-# COPY . .
+# Add a non-root user (e.g., 'appuser')
+RUN useradd -m appuser
+
+# Give ownership of the app directory to the new user
+RUN chown -R appuser /app
+
+# Switch to the non-root user
+USER appuser
+
+# Copy the rest of the application code
+COPY . .
 
 # Expose the port that Next.js will run on
 EXPOSE 3000