First test commit

backend/Dockerfile

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+# Use official Node.js runtime
+FROM node:20-alpine
+
+# Create app directory
+WORKDIR /usr/src/app
+
+# Copy package files first (better caching)
+COPY package*.json ./
+
+# Install dependencies
+RUN npm ci --only=production
+
+# Copy application source
+COPY . .
+
+# Expose the app port
+# EXPOSE 3000
+
+# Environment variable
+ENV NODE_ENV=production
+
+# Start the application
+CMD ["node", "src/index.js"]