refactor Dockerfile to use multi-stage builds for improved efficiency

use multi-stage builds for improved efficiency

Dockerfile

@@ -1,14 +1,63 @@
-FROM node:lts-alpine
+# Build stage
+FROM node:lts-alpine AS builder
 
+# Set working directory
 WORKDIR /app
+
+# Copy package files
 COPY package.json package-lock.json ./
+
+# Install all dependencies (including dev dependencies needed for build)
 RUN npm ci
 
-COPY docker-entrypoint.sh .
-COPY src ./src
+# Copy source code
+COPY --chown=node:node . .
 
-RUN npm run build && rm -rf package*.json
+# Build the application with minification
+RUN npm run build -- --minify
 
+# Prune dependencies stage
+FROM node:lts-alpine AS deps
 
+WORKDIR /app
 
+# Copy package files
+COPY --from=builder /app/package.json /app/package-lock.json ./
+
+# Install production dependencies only
+RUN npm install --omit=dev --production && \
+    # Remove unnecessary npm cache and temp files to reduce size
+    npm cache clean --force && \
+    rm -rf /tmp/* /var/cache/apk/*
+
+# Production stage
+FROM node:lts-alpine AS production
+
+# Add Docker Alpine packages and remove cache in the same layer
+RUN apk --no-cache add ca-certificates tini && \
+    rm -rf /var/cache/apk/*
+
+# Set non-root user for better security
+USER node
+
+# Set working directory owned by node user
+WORKDIR /app
+
+# Copy only the built application and entry point from builder
+COPY --from=builder --chown=node:node /app/dist ./dist
+COPY --from=builder --chown=node:node /app/docker-entrypoint.sh .
+
+# Copy only production node_modules
+COPY --from=deps --chown=node:node /app/node_modules ./node_modules
+
+# Make entry point executable
+RUN chmod +x /app/docker-entrypoint.sh
+
+# Set environment to production to disable development features
+ENV NODE_ENV=production
+
+# Use tini as init system to properly handle signals
+ENTRYPOINT ["/sbin/tini", "--"]
+
+# The command to run
 CMD [ "/app/docker-entrypoint.sh" ]