message: feat(Docker): Multi-stage build added
  Build process changed to multi-stage
diff: -FROM bwsw/alpine-nginx-node
  -VOLUME /config/
  +FROM node:alpine as builder
  +
  +COPY . /tmp/cloudstackui
  +
  +WORKDIR /tmp/cloudstackui
  +
  +RUN yarn install --verbose \
  + && yarn run build:aot
  +
  +FROM nginx:stable-alpine
  COPY .build/nginx.conf /etc/nginx/conf.d/default.conf
  COPY .build/startup.sh /etc/nginx/startup.sh
  -COPY . /tmp/cloudstackui
  -RUN apk update && \
  - apk add --update curl && \
  - cd /tmp/cloudstackui && \
  - yarn && yarn run build:aot && yarn cache clean && \
  - mkdir -p /static && cp -R dist/. /static/ && \
  - chmod 777 /etc/nginx/startup.sh && chmod 755 /static \
  - && rm -rf /tmp/cloudstackui
  +
  +COPY --from=builder /tmp/cloudstackui/dist /static/
  +
  +RUN chmod 777 /etc/nginx/startup.sh
  +
  +VOLUME /config/
  +
  +RUN apk update \
  + && apk add --update curl \
  + && rm -rf /var/cache/apk/*
  CMD ["/bin/sh", "-e", "/etc/nginx/startup.sh"]
  