Add Submodule for Apple Containers to Kubernetes Module

[kevinevans1]

As a platform engineer,
I want to integrate the Apple Container project as a submodule within our Kubernetes-related infrastructure,
so that we can support Apple’s container runtime and tooling in Kubernetes-native environments for specialized macOS or ARM-based workloads.

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✅ Acceptance Criteria
• The Apple Container GitHub repository is added as a Git submodule under the appropriate directory (e.g., /kubernetes/apple-container/).
• The integration includes clear documentation on how to:
• Build Apple container images
• Deploy them to a Kubernetes cluster
• Handle macOS/ARM64-specific constraints or nodes
• Any required custom resources or Kubernetes manifests are included or referenced clearly
• Code is reviewed and adheres to repo formatting, structure, and accessibility guidelines
• README is updated to explain the new submodule and provide a basic example

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📘 Notes
• Apple/container is Apple’s open-source OCI-compliant container runtime with a focus on security and macOS compatibility.
• This integration will help us explore hybrid scenarios where Apple silicon or Darwin workloads are part of our containerized environment.

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📎 Related Links
• Apple Container GitHub Repo
• Kubernetes Runtime Class Docs
• ContainerD & CRI-O Alternatives