remove copy

Dockerfile

-# pull official base image
+
 FROM node:13.12.0-alpine
 
-# set working directory
 WORKDIR /app
 
-# install app dependencies
 COPY package.json ./
 COPY package-lock.json ./
 RUN npm install --silent
 RUN npm install react-scripts@3.4.1 -g --silent
 
-# add app
-COPY . ./
-
-# start app
 CMD ["npm", "start"]
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