Reactweb application Running on port 80 with Dockerfile

we have a reactweb application running on port 3000 previously for production we want to use port 80. But when I run the application in local with sudo yarn run web and when I enter the password I can access the application in localhost:80. From Dockerfile sudo is not working in apline images.

     Dockerfile:
         FROM node:9-alpine as builder
         # Create a directory where our app will be placed. This might not be 
         necessary
         RUN mkdir -p /root
        # Change directory so that our commands run inside this new directory
         WORKDIR /root
       # Get all the code needed to run the app
       COPY . /root 
       WORKDIR /root
       # Expose the port the app runs in
       RUN npm install --global yarn@1.6.0
       RUN chmod a+rwx  /usr/local/lib/node_modules/yarn/bin/yarn*
       RUN chmod a+rwx  /usr/local/bin/yarn*
       RUN yarn -v
       RUN yarn install
       RUN yarn add @material-ui/icons
       EXPOSE 80
       CMD yarn run web
     From node:9-alpine
     WORKDIR /root
     COPY --from=builder /root .
     RUN ls -la
     EXPOSE 80
     CMD yarn run web

The host container and port container should be on port 80.