76527413/test repository overview

RUN cat /etc/apt/sources.list && \
    sed -i 's|deb.debian.org|mirrors.ustc.edu.cn|g' /etc/apt/sources.list && \
    sed -i 's|security.debian.org/debian-security|mirrors.ustc.edu.cn/debian-security|g' /etc/apt/sources.list && \
    apt update -qqy