Optimize Dockerfile for smaller image size using Next.js standalone

Dockerfile

@@ -39,21 +39,19 @@ RUN echo "invalidate cache" && echo $(git rev-parse --short HEAD 2>/dev/null ||
     NODE_OPTIONS='--max_old_space_size=2048' NEXT_TELEMETRY_DISABLED=1 pnpm run build
 
 # ---- Production Stage ----
-# Use Node 20 for production as well to match builder
+# Use a smaller base image for production
 FROM node:20-alpine AS runner
 
 # Set working directory inside the container
 WORKDIR /app
 
-# Install pnpm in production stage
-RUN corepack enable && corepack prepare pnpm@latest --activate
+# Copy the standalone build from builder
+COPY --from=builder /app/.next/standalone ./
 
-RUN mkdir -p /app/public
+# Copy static files
+COPY --from=builder /app/.next/static ./.next/static
 
-# Copy only necessary files from builder
-COPY --from=builder /app/package.json /app/pnpm-lock.yaml ./
-COPY --from=builder /app/.next ./.next
-COPY --from=builder /app/node_modules ./node_modules
+# Copy public files
 COPY --from=builder /app/public ./public
 
 # Copy commit hash file from builder
@@ -71,4 +69,4 @@ ENV API_HOSTNAME=internal-api.inboxi.ng
 # The file is available at /app/git_commit_sha if needed
 
 # Start Next.js server
-CMD ["pnpm", "run", "start"]
+CMD ["node", "server.js"]