update Dockerfile

Dockerfile

@@ -7,17 +7,14 @@ RUN mkdir -p /usr/src/app/server
 WORKDIR /usr/src/app
 
 # Install app dependencies
-COPY package.json /usr/src/app/
-COPY package-lock.json /usr/src/app/
 COPY yarn.lock /usr/src/app/
+COPY package.json /usr/src/app/
 
 COPY server/yarn.lock /usr/src/app/server
 COPY server/package.json /usr/src/app/server
-COPY server/package-lock.json /usr/src/app/server
 
 COPY client/yarn.lock /usr/src/app/client
 COPY client/package.json /usr/src/app/client
-COPY client/package-lock.json /usr/src/app/client
 
 RUN npm install yarn -g
 RUN yarn