Use alpine images in dockerfile

Dockerfile

@@ -1,9 +1,9 @@
-FROM node
+FROM node:10-alpine
 
 COPY . /app
 WORKDIR /app
 RUN npm install && npm run build
 
-FROM nginx
+FROM nginx:alpine
 COPY --from=0 /app/dist /usr/share/nginx/html
 EXPOSE 80