GB200 and newer Ubuntu runtime fixes needed in Cloud Native Stack playbooks

[ericrife]

Problem

Cloud Native Stack playbooks currently have a few behaviors that cause problems
on GB200 systems, retry/reapply workflows, and newer Ubuntu runtimes:

• Calico autodetection does not include enP* interfaces.
• GPU Operator install tasks use helm install --generate-name, which is not
  retry-safe.
• Docker CE installs are selected as latest, which can drift between runs and
  does not encode the apt architecture.
• Ubuntu apt repository key tasks still use Ansible apt_key, which depends on
  the deprecated apt-key executable.

Observed Failure

During Ubuntu 26.04 runtime validation, CNS install failed at:

TASK [Add an Kubernetes apt signing key for Ubuntu]

With:

Failed to find required executable "apt-key"

Proposed Fix

Apply the prepared field-fix patch series:

1. Add enP* to Calico autodetection.
2. Convert GPU Operator Helm installs to helm upgrade --install gpu-operator.
3. Add Docker CE version and architecture variables and use pinned apt package
   installs.
4. Replace active Ubuntu apt_key usage with keyring downloads/dearmor and
   signed-by apt repository handling.

Patch commit summary:

• Add enP* as a device prefix for Calico.
• Make GPU Operator install retry-safe.
• Add Docker CE versioning and architecture support.
• Replace apt-key usage for Ubuntu runtimes.

Validation

Local validation passed against the prepared patch series:

• git diff --check
• YAML parse checks for touched YAML files
• Ansible syntax checks for:
  • playbooks/prerequisites.yaml
  • playbooks/nvidia-driver.yaml
  • playbooks/nvidia-docker.yaml
  • playbooks/operators-install.yaml
  • playbooks/k8s-install.yaml
  • playbooks/cns.yaml

Maintainer Review Checklist

• Confirm whether gpu-operator is acceptable as the stable Helm release name.
• Confirm Docker CE version defaults for CNS 16.0, 16.1, and 17.0.
• Confirm the enP* Calico autodetection prefix matches expected GB200 NIC
  naming.
• Confirm keyring paths:
  • /etc/apt/keyrings/kubernetes-apt-keyring.gpg
  • /etc/apt/keyrings/cri-o-apt-keyring.gpg
  • /etc/apt/keyrings/docker.asc
  • /usr/share/keyrings/nvidia-container-toolkit-keyring.gpg
• Decide whether to split this into separate PRs by topic or accept as one
  field-fix bundle.

[Hardikrepo]

Opened #143 to address this.