Dockerfile中Ubuntu18.04 apt-get更换清华源

清华源ubuntu

针对 x86架构

RUN mv /etc/apt/sources.list /etc/apt/sources.list.bak
RUN echo "deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse" >> /etc/apt/sources.list
RUN echo "deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse" >>/etc/apt/sources.list
RUN echo "deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse" >>/etc/apt/sources.list
RUN echo "deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse" >>/etc/apt/sources.list

针对arm架构
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