fix: use node12

Dockerfile

@@ -1,4 +1,4 @@
-FROM node:10-alpine as builder
+FROM node:12-alpine as builder
 WORKDIR /code
 RUN yarn config set registry https://registry.npm.taobao.org/
 ADD package.json /code
@@ -8,4 +8,4 @@ ADD . /code
 RUN yarn build:prod
 
 FROM nginx:1.19-alpine
-COPY --from=builder /code/dist/ /var/www/html/dist/
+COPY --from=builder /code/dist/ /var/www/html/dist/