build: optimize Docker image with multi-stage build and security improvements

- Implement multi-stage build to reduce final image size
- Install only production dependencies with npm ci --only=production
- Clean npm cache to reduce image size
- Improve layer caching by copying package files before application code
- Update package version from 1.0.0 to 1.0.1

Dockerfile

@@ -1,15 +1,22 @@
-FROM node:23-slim
+FROM node:24-slim AS builder
 
 WORKDIR /usr/src/app
 
+# Copy dependency files first
+COPY package*.json ./
+
+# Install production dependencies only
+RUN npm ci --only=production && npm cache clean --force
+
+FROM node:24-slim
+
+WORKDIR /usr/src/app
+
+COPY --from=builder /usr/src/app/node_modules ./node_modules
+
+# Copy application code
+COPY . .
+
 EXPOSE 3000
 
-COPY package.json /usr/src/app/package.json
-
-RUN npm install
-
-USER node
-
-COPY . /usr/src/app/
-
 CMD ["npm", "start"]

package.json

@@ -1,6 +1,6 @@
 {
   "name": "no-as-service",
-  "version": "1.0.0",
+  "version": "1.0.1",
   "description": "A lightweight API that returns random rejection or no reasons.",
   "main": "index.js",
   "scripts": {