fix: update Dockerfile to use multi-stage build for optimized production image

Dockerfile

@@ -1,7 +1,26 @@
+# Build stage
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+# Copy package files
+COPY package*.json ./
+
+# Install dependencies
+RUN npm ci
+
+# Copy source code
+COPY ./src ./src
+COPY vite.config.js .
+
+# Build the application
+RUN npm run build
+
+# Production stage
 FROM nginx:stable-alpine
 
-# Copy the contents of the repo to the container
+# Copy built files from builder stage
-COPY ./dist /usr/share/nginx/html
+COPY --from=builder /app/dist /usr/share/nginx/html
 
 # Move the customized nginx config file to the nginx folder
 RUN mv /usr/share/nginx/html/.docker/default.conf /etc/nginx/conf.d/default.conf