Create Dockerfile

Dockerfile

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+# Stage 1: Build React Client
+FROM node:18-alpine as client-build
+WORKDIR /app/client
+COPY client/package*.json ./
+RUN npm install
+COPY client/ ./
+RUN npm run build
+
+# Stage 2: Production Server
+FROM node:18-alpine
+WORKDIR /app
+COPY package*.json ./
+RUN npm install
+COPY server/ ./server/
+# Move built client to server's public folder
+COPY --from=client-build /app/client/dist ./public
+
+ENV PORT=7860
+EXPOSE 7860
+CMD ["node", "server/index.js"]