Update Dockerfile

Dockerfile

-FROM node:16
-
-WORKDIR /usr/src/app
-COPY package*.json ./
+FROM node:14.15.1 as build-stage
+WORKDIR /app
+COPY package*.json /app/
 RUN npm install
-#RUN npm install --silent
-#RUN npm install react-scripts@3.4.1 -g --silent
+COPY ./ /app/
+RUN npm run build
 
-COPY . .
+FROM nginx:1.15
+COPY --from=build-stage /app/build/ /usr/share/nginx/html
+COPY nginx.conf /etc/nginx/conf.d/default.conf
 
-EXPOSE 8080
-EXPOSE 3000
-CMD [ "node", "app.js" ]
-#CMD ["npm", "start"]
\ No newline at end of file
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"
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