Dockerfile improvement

frontend/Dockerfile

@@ -1,13 +1,40 @@
+# Use node 18 alpine for smaller image size
 FROM node:18-alpine
 
 WORKDIR /app
 
-COPY package*.json ./
-RUN npm ci --omit=dev
+# Install dumb-init for proper signal handling
+RUN apk add --no-cache dumb-init
 
+# Copy package files
+COPY package*.json ./
+
+# Install all dependencies (including devDependencies needed for build)
+# Set npm config for better CI performance
+RUN npm ci --prefer-offline --no-audit
+
+# Copy source code
 COPY . .
+
+# Set Node.js memory limit for build (helpful in constrained environments)
+ENV NODE_OPTIONS="--max-old-space-size=1024"
+
+# Build the application
 RUN npm run build
 
+# Remove devDependencies after build to reduce image size
+RUN npm prune --omit=dev
+
+# Create non-root user for security
+RUN addgroup -g 1001 -S nodejs
+RUN adduser -S nextjs -u 1001
+
+# Change ownership of the app directory
+RUN chown -R nextjs:nodejs /app
+USER nextjs
+
 EXPOSE 3000
 
+# Use dumb-init to handle signals properly
+ENTRYPOINT ["dumb-init", "--"]
 CMD ["npm", "start"]