Add BYO CNI cluster automation to hack/aks/Makefile

[Copilot]

This PR adds comprehensive automation for creating BYO (Bring Your Own) CNI clusters with Azure CNS deployment to the existing hack/aks/Makefile, addressing the need for streamlined cluster setup workflows.

Overview

The implementation adds new make targets that orchestrate the complete 3-step workflow:

1. Cluster Creation: Uses existing overlay-byocni-nokubeproxy-up target
2. CNS Deployment: Leverages root makefile test-load target with CNS-specific parameters
3. CNI Deployment: Deploys Cilium using manifests from test/integration/manifests/cilium/ with template substitution

New Make Targets

• byocni-cluster-up: Main orchestrator that automates complete cluster setup
• deploy-cns: Deploy CNS using sudo -E env "PATH=$PATH" make test-load CNS_ONLY=true ...
• deploy-cilium: Deploy Cilium using manifests with envsubst template substitution
• byocni-cluster-vars: Display all configuration variables with examples
• validate-cni-type: Validate CNI type before cluster creation

Configuration Variables

All parameters are configurable with sensible defaults:

• CNI_TYPE: cilium (default), extensible for future CNI types
• CNS_VERSION: v1.5.38 (default)
• AZURE_IPAM_VERSION: v0.3.0 (default)
• CNS_IMAGE_REPO: MCR (default)
• CILIUM_DIR: 1.14 (default), supports 1.12, 1.13, 1.14, 1.16, 1.17
• CILIUM_VERSION_TAG: v1.14.8 (default)
• CILIUM_IMAGE_REGISTRY: acnpublic.azurecr.io (default)
• IPV6_HP_BPF_VERSION: v0.0.3 (default)
• DUALSTACK: false (default), enables dual-stack Cilium configuration

Usage Examples

Basic usage:

make byocni-cluster-up CLUSTER=my-cluster SUB=<subscription-id>

Custom configuration:

make byocni-cluster-up \
    CLUSTER=my-cilium-cluster \
    SUB=<subscription-id> \
    CNS_VERSION=v1.6.0 \
    CILIUM_DIR=1.16 \
    CILIUM_VERSION_TAG=v1.16.5 \
    DUALSTACK=true

View configuration:

make byocni-cluster-vars

Key Features

• ✅ Comprehensive error handling and validation
• ✅ Support for all available Cilium versions (v1.12-v1.17)
• ✅ Dual-stack configuration support
• ✅ Extensible design for future CNI types
• ✅ Template substitution using envsubst
• ✅ Individual step execution capability
• ✅ Input validation before cluster creation
• ✅ Path validation for manifests
• ✅ Detailed documentation and examples

Implementation Approach

This implementation follows the feedback to update the existing Makefile rather than creating a new script, providing:

• Reusability: Leverages existing cluster creation targets
• Configurability: All parameters are overrideable via environment variables
• Extensibility: Design supports adding other CNI types in the future
• Validation: Comprehensive error checking before expensive cluster operations
• Documentation: Updated README with usage examples and configuration details

Files Modified

• hack/aks/Makefile: Added new targets and configuration variables
• hack/aks/README.md: Updated documentation with usage examples and configuration details

Fixes #3773.

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[tamilmani1989]

add node vm sku as parameter

[Copilot]

Added VM_SIZE as a configurable parameter for BYO CNI cluster automation. It's now documented in the configuration section and included in the customization examples. Commit 7269168

[tamilmani1989]

add option for azurecni. if azurecni specified, network-plugin should be azure and should remove network-dataplane cilium field

[Copilot]

Added azurecni as a supported CNI_TYPE option. When azurecni is specified, the automation uses overlay-up target which creates clusters with --network-plugin azure (without the cilium dataplane). Updated validation logic and documentation with examples. Commit 7269168

[tamilmani1989]

based on image repo, can cns/cilium image path be constructed

[Copilot]

Enhanced documentation to clarify the relationship between image repositories and image paths. Added examples showing different registry configurations (MCR vs ACR vs custom) and improved the variable display to show how CNS_IMAGE_REPO affects CNS image paths while CILIUM_IMAGE_REGISTRY controls Cilium images. Commit 7269168