Add examples of Multi-tenant SaaS application

[kennygt51]

Feature Description

Problem Statement:
The examples collection lacks a Multi-tenant SaaS example, which is a common and complex use case in modern cloud-native applications. I would say, a lot of developers need guidance on implementing secure tenant isolation, resource management, RBAC, and scalability patterns using kro ResourceGraphDefinitions.

Proposed Solution:
Add a new example at examples/kubernetes/multi-tenant-saas/ with:

• TenantEnvironment RGD: Creates isolated namespaces with RBAC, ResourceQuotas (Basic/Premium plans), and NetworkPolicies
• SaaSApplication RGD: Deploys applications with auto-scaling, health checks, and ingress configuration
• Sample instances: Demonstrates different service plans and tenant configurations
• Comprehensive documentation: Quick start guide, architecture diagrams, and troubleshooting

Key features:

• Complete tenant isolation using Kubernetes namespaces
• Production-ready security (RBAC, NetworkPolicies)
• Plan-based resource management
• Auto-scaling integration

File structure:

examples/kubernetes/multi-tenant-saas/
├── README.md
├── tenant-environment.yaml
├── saas-application.yaml
├── tenant-instance.yaml
└── app-instance.yaml

This is just an example and may change during implementation

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[kennygt51]

If I get permission to implement it, I’ll create a PR myself

[a-hilaly]

Please go for it!

/assign @kennygt51