refixed dockerfile

Dockerfile

@@ -10,7 +10,7 @@ RUN cd server && npm install && npm run build
 
 FROM node:latest AS serve
 WORKDIR /usr/src/app
-COPY package*.json ./
+COPY server/package*.json ./
 RUN npm install --only=production
 COPY --from=server-build /usr/src/app/server/dist ./distServer
 COPY --from=client-build /usr/src/app/client/dist ./distClient