Chnage Dockerfile from single stage to multistage

Dockerfile

@@ -1,23 +1,23 @@
-# Use the official Node.js image as the base image
+# ─── Stage 0: Base ────────────────────────────────────────────────────────────
-FROM docker.arvancloud.ir/node:18
+FROM node:20-alpine AS base
+WORKDIR /app
 
-# Set the working directory inside the container
+# ─── Stage 1: Dependencies ───────────────────────────────────────────────────
-WORKDIR /usr/src/app
+FROM base AS deps
-
-# Copy package.json and package-lock.json to the working directory
 COPY package*.json ./
+RUN npm ci
 
-# Install the application dependencies
+# ─── Stage 2: Builder ─────────────────────────────────────────────────────────
-RUN npm install
+FROM deps AS builder
-
-# Copy the rest of the application files
 COPY . .
-
-# Build the NestJS application
 RUN npm run build
+RUN npm ci --omit=dev --ignore-scripts
 
-# Expose the application port
+# ─── Stage 3: Production ──────────────────────────────────────────────────────
+FROM base AS production
+ENV NODE_ENV=production
+COPY --from=builder --chown=appuser:appgroup /app/dist ./dist
+COPY --from=builder --chown=appuser:appgroup /app/node_modules ./node_modules
+COPY --from=builder --chown=appuser:appgroup /app/package.json ./package.json
 EXPOSE 3000
-
-# Command to run the application
 CMD ["node", "dist/main"]