[release-22.04] Update NVIDIA signing key for package repos

[ajdecon]

See
https://developer.nvidia.com/blog/updating-the-cuda-linux-gpg-repository-key/
for details on the key changes.

This commit:

• Removes the nvidia-ml repo, which is deprecated and will not be
  updated
• Updates the nvidia_cuda and nvidia_dcgm roles to use the new key and
  install workflow
• Updates roles/requirements.txt to point to an updated version of
  nvidia.nvidia_driver

[cocakohler]

@ajdecon Just to understand it fully: I deployed DeepOps 22.04 4 days ago. Do i have to expect issues with my installation? How can i update to the lastest 22.04.1 without redelpying the whole K8s cluster ?

[ajdecon]

@cocakohler :

The only changes are to the package repository configuration for the NVIDIA apt and yum repositories. You do not need to re-deploy your cluster, and this change should not impact the operation of your cluster. However, you will need to apply the key rotation changes in order to run package updates on software provided by these repositories.

The only three components in DeepOps that are impacted by these changes are the NVIDIA driver, CUDA, and DCGM. If you installed any of the impacted components, you should be able to update the configuration by re-running the appropriate component playbook (nvidia-driver.yml, nvidia-cuda.yml, or nvidia-dcgm.yml)

Alternatively, you can apply these changes manually using the instructions in the blog post.

If you are running DGX OS 5, please see the DGX OS instructions