cat > /etc/apt/sources.list << EOF deb https://mirrors.tuna.tsinghua.edu.cn/debian/ bullseye main contrib non-free deb https://mirrors.tuna.tsinghua.edu.cn/debian/ bullseye-updates main contrib non-free deb https://mirrors.tuna.tsinghua.edu.cn/debian/ bullseye-backports main contrib non-free deb https://mirrors.tuna.tsinghua.edu.cn/debian-security bullseye-security main contrib non-free EOF
RUN echo "deb https://mirrors.tuna.tsinghua.edu.cn/debian/ bullseye main contrib non-free" >/etc/apt/sources.list RUN echo "deb https://mirrors.tuna.tsinghua.edu.cn/debian/ bullseye-updates main contrib non-free" >>/etc/apt/sources.list RUN echo "deb https://mirrors.tuna.tsinghua.edu.cn/debian/ bullseye-backports main contrib non-free" >>/etc/apt/sources.list RUN echo "deb https://mirrors.tuna.tsinghua.edu.cn/debian-security bullseye-security main contrib non-free" >>/etc/apt/sources.list RUN apt-get clean RUN apt-get update RUN apt-get install -y curl telnet vim iputils-ping net-tools