dockerise for push

frontend/dockerfile

@@ -0,0 +1,13 @@
+FROM node:20-alpine as build-stage
+WORKDIR /app
+COPY package*.json ./
+RUN npm install
+COPY . .
+RUN npm run build
+
+FROM node:20-alpine as production-stage
+WORKDIR /app
+COPY --from=build-stage /app /app
+EXPOSE 3000
+ENV NODE_ENV=production
+CMD ["npm", "run", "start"]