系统换源

清华源

https://mirror.tuna.tsinghua.edu.cn/help/alpine/

ubuntu换源

sed -i "2i RUN  sed -i 's/deb.debian.org/mirrors.ustc.edu.cn/g' /etc/apt/sources.list " jrt

sed -i 's/deb.debian.org/mirrors.ustc.edu.cn/g' /etc/apt/sources.list