npm install before adding the rest of files in dockerfile

Dockerfile

 COPY package.json /usr/src/app/
 RUN apt-get update -y && apt-get upgrade -y && \
     apt-get install -y nodejs npm libcairo2-dev libjpeg62-turbo-dev libpango1.0-dev libgif-dev libpng-dev build-essential g++ ffmpeg
-COPY ./ /usr/src/app/
+COPY package.json* yarn.lock* .npmrc* /usr/src/app/
 RUN npm install --production
 
+COPY ./ /usr/src/app/
+
 EXPOSE 8888
 CMD [ "npm", "start" ]