anchor.diff:  FROM ubuntu:16.04 as builder
   
   ARG localbuild
  -RUN if [ "x$localbuild" != "x" ]; then sed -i 's#http://archive.ubuntu.com/#http://qnap.dorowu.com/#' /etc/apt/sources.list; fi
  +RUN if [ "x$localbuild" != "x" ]; then sed -i 's#http://archive.ubuntu.com/#http://tw.archive.ubuntu.com/#' /etc/apt/sources.list; fi
   
   RUN apt-get update \
       && apt-get install -y --no-install-recommends curl ca-certificates
  
positive.code: FROM ubuntu:16.04 as system
  
  ARG localbuild
  RUN if [ "x$localbuild" != "x" ]; then sed -i 's#http://archive.ubuntu.com/#http://qnap.dorowu.com/#' /etc/apt/sources.list; fi
  
  # built-in packages
  RUN apt-get update \
  
negative.code: ################################################################################
  # merge
  ################################################################################
  FROM system
  LABEL maintainer="fcwu.tw@gmail.com"
  
  COPY --from=builder /src/web/dist/ /usr/local/lib/web/frontend/
  COPY image /
  
  