add docker

Dockerfile

@@ -0,0 +1,23 @@
+FROM node:20-alpine AS build
+
+WORKDIR /app
+
+COPY package.json package-lock.json ./
+RUN npm install
+
+COPY . .
+RUN npm run build
+
+# Stage 2: Production
+FROM node:20-alpine
+
+WORKDIR /app
+
+COPY --from=build /app/build ./build
+COPY --from=build /app/package.json ./package.json
+
+RUN npm install --production
+
+EXPOSE 3000
+
+CMD node build/index.js