update dokcer

Dockerfile

@@ -1,17 +1,19 @@
-# Use an official Node.js image
+# Use the official Node.js image as a base
 FROM node:20
 
-# Create and set the working directory
+# Set the working directory
 WORKDIR /app
 
-# Copy package.json and install dependencies
-COPY package.json package-lock.json ./
-RUN yarn install
+# Copy package.json and yarn.lock to install dependencies
+COPY package.json yarn.lock ./
 
-# Add a non-root user (e.g., 'appuser')
+# Install dependencies using Yarn (use --frozen-lockfile for consistency)
+RUN yarn install --frozen-lockfile --unsafe-perm=true
+
+# Create a non-root user and set permissions
 RUN useradd -m appuser
 
-# Give ownership of the app directory to the new user
+# Ensure the /app directory is owned by the non-root user
 RUN chown -R appuser /app
 
 # Switch to the non-root user
@@ -20,8 +22,14 @@ USER appuser
 # Copy the rest of the application code
 COPY . .
 
-# Expose the port that Next.js will run on
+# Create the .next directory (this can sometimes be needed to ensure build process has the right permissions)
+RUN mkdir -p /app/.next && chown -R appuser /app/.next
+
+# Build the Next.js app
+RUN yarn build
+
+# Expose the port the app will run on
 EXPOSE 3000
 
-# Run the Next.js development server
-CMD ["yarn", "run", "build"]
+# Start the Next.js app
+CMD ["yarn", "start"]