anchor.diff:      DOTNET_SETUP_DIR=/usr/src/dotnet-build \
       BUILD_CHINA=false
       
  -ARG NPM_DEFAULT_PACKAGE=gulp-cli grunt-cli bower markdown-styles yarn gulp
  -
   COPY setup/ ${DOTNET_SETUP_DIR}/
   
   RUN chmod +x ${DOTNET_SETUP_DIR}/china.sh && ${DOTNET_SETUP_DIR}/china.sh
  
positive.code:         python" \
  && BUILD_DEPENDENCIES="xz-utils " \
  && apt-get update \
  && apt-get install --no-install-recommends --no-install-suggests -y ${RUNTIME_DEPENDENCIES} ${BUILD_DEPENDENCIES} \
  && cd "${DOTNET_SETUP_DIR}/" \
  
  ##### ##### ##### ##### ##### ##### ##### ##### ##### #####
  #                           
  
negative.code: #  PS：还可以挂载到宿主机类库到指定目录下执行dotnet restore --packages <PACKAGES_DIRECTORY>
  #                          
  ##### ##### ##### ##### ##### ##### ##### ##### ##### #####
  RUN echo " Install .Net Core SDK  " \
  
  && cd "${DOTNET_SETUP_DIR}/" \
  && DOTNET_SDK_DOWNLOAD_URL="https://dotnetcli.blob.core.windows.net/dotnet/Sdk/$DOTNET_SDK_VERSION/dotnet-dev-debian-x64.$DOTNET_SDK_VERSION.tar.gz" \
  && wget -cq ${DOTNET_SDK_DOWNLOAD_URL} -O "${DOTNET_SETUP_DIR}/dotnet.tar.gz" \
  && mkdir -p /usr/share/dotnet \
  && tar -zxf "${DOTNET_SETUP_DIR}/dotnet.tar.gz" -C /usr/share/dotnet \
  && ln -sf /usr/share/dotnet/dotnet /usr/bin/dotnet \
  