add docker file

Dockerfile

@@ -0,0 +1,39 @@
+# Build stage
+FROM node:20-alpine AS builder
+
+# Set working directory
+WORKDIR /app
+
+# Copy package files
+COPY package*.json ./
+COPY tsconfig.json ./
+
+# Install all dependencies (including dev dependencies for building)
+RUN npm ci
+
+# Copy source code
+COPY src/ ./src/
+
+# Build the application
+RUN npm run build
+
+# Production stage
+FROM node:20-alpine AS production
+
+# Set working directory
+WORKDIR /app
+
+# Copy package files
+COPY package*.json ./
+
+# Install production dependencies only
+RUN npm ci --only=production
+
+# Copy built application from builder stage
+COPY --from=builder /app/dist ./dist
+
+# Expose port
+EXPOSE 3000
+
+# Start the application
+CMD ["npm", "start"]