Default values for nvidia_apt_key_urls has to be updated

# ----- Not working with default values
$ juju config containerd nvidia_apt_sources
deb https://nvidia.github.io/libnvidia-container/{id}{version_id}/$(ARCH) /
deb https://nvidia.github.io/nvidia-container-runtime/{id}{version_id}/$(ARCH) /
deb https://developer.download.nvidia.com/compute/cuda/repos/{id}{version_id_no_dot}/x86_64 /

$ sudo apt update
Hit:1 https://artifacts.elastic.co/packages/6.x/apt stable InRelease
Hit:2 http://archive.ubuntu.com/ubuntu focal InRelease
Hit:3 https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64 InRelease
Ign:4 https://nvidia.github.io/libnvidia-container/deb/amd64 InRelease
Hit:5 http://archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:6 https://nvidia.github.io/nvidia-container-runtime/ubuntu20.04/amd64 InRelease
Err:7 https://nvidia.github.io/libnvidia-container/deb/amd64 Release
  404 Not Found [IP: 192.168.20.14 8000]
Hit:8 http://archive.ubuntu.com/ubuntu focal-security InRelease
Get:9 http://archive.ubuntu.com/ubuntu focal-backports InRelease [108 kB]
Hit:10 http://ppa.launchpad.net/telegraf-devs/ppa/ubuntu focal InRelease
Reading package lists... Done
E: The repository 'https://nvidia.github.io/libnvidia-container/deb/amd64 Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
root@dgx08:/home/ubuntu# sudo vi /etc/apt/sources.list.d/nvidia.list
root@dgx08:/home/ubuntu# sudo vi /etc/apt/sources.list.d/nvidia.list
root@dgx08:/home/ubuntu# sudo apt update
Hit:1 http://archive.ubuntu.com/ubuntu focal InRelease
Hit:2 https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64 InRelease
Ign:3 https://nvidia.github.io/libnvidia-container/stable/ubuntu20.04/amd64 InRelease
Hit:4 http://archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:5 https://nvidia.github.io/nvidia-container-runtime/ubuntu20.04/amd64 InRelease
Hit:6 https://artifacts.elastic.co/packages/6.x/apt stable InRelease
Hit:7 http://archive.ubuntu.com/ubuntu focal-security InRelease
Err:8 https://nvidia.github.io/libnvidia-container/stable/ubuntu20.04/amd64 Release
  404 Not Found [IP: 192.168.20.14 8000]
Get:9 http://archive.ubuntu.com/ubuntu focal-backports InRelease [108 kB]
Hit:10 http://ppa.launchpad.net/telegraf-devs/ppa/ubuntu focal InRelease
Reading package lists... Done

# ----- Refs
There is no repository "deb https://nvidia.github.io/libnvidia-container/{id}{version_id}/$(ARCH)"
See 404 not found in log

Possible repositories can be seen under
https://nvidia.github.io/libnvidia-container/ubuntu20.04/libnvidia-container.list