Ubuntu下，构建docker报错The repositoryis ... not signed.解决

报错具体为E: The repository 'https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64 InRelease' is not signed.

这是因为nvidia更新了密钥库，在dockerfile文件加入

RUN rm /etc/apt/sources.list.d/cuda.list
RUN apt-key del 7fa2af80
RUN apt-key adv --fetch-keys https://developer.download.nvidia.com/compute/cuda/repos/$distro/$arch/7fa2af80.pub

其中$distro/$arch换成本dockerfile From的ubuntu版本和架构（并非操作系统的版本）

如：

• ubuntu1804/cross-linux-sbsa

• ubuntu1804/ppc64el

• ubuntu1804/sbsa

• ubuntu1804/x86_64

• ubuntu2004/cross-linux-sbsa

• ubuntu2004/sbsa

• ubuntu2004/x86_64

• ubuntu2204/sbsa

• ubuntu2204/x86_64

参考：https://github.com/NVIDIA/nvidia-docker/issues/1631