Implement complete OpenFGA Kubernetes operator with status checks and build system

[Copilot]

This PR implements a complete Kubernetes operator for OpenFGA (Fine-Grained Authorization) from scratch, including comprehensive status checks and a robust build system as requested in the issue.

Key Features Implemented

🏗️ Complete Rust-based Kubernetes Operator

• Built using the kube-rs ecosystem for native Kubernetes integration
• Implements full reconciliation loop for OpenFGA resources
• Automatic creation and management of Deployments and Services
• Real-time status tracking and updates

📋 Custom Resource Definition (CRD)

• Comprehensive OpenFGA CRD with support for:
  • Multiple datastore backends (memory, PostgreSQL, MySQL)
  • Configurable replica counts and container images
  • Optional playground interface
  • Separate gRPC and HTTP port configurations
• JSON Schema validation for all custom resource fields

🔧 Build System & Status Checks

• Makefile with all required targets:
  • make compile - Syntax and dependency checking
  • make build - Release builds
  • make test - Unit test execution
  • make fmt - Code formatting
  • make clippy - Linting
  • make check-all - Comprehensive quality checks

🚀 CI/CD Pipeline

• GitHub Actions workflow providing automated status checks:
  • Compile validation
  • Build verification
  • Test suite execution
  • Code formatting checks
  • Clippy linting
• All checks run on pull requests and provide clear pass/fail status

🧪 Comprehensive Testing

• Unit tests for all custom resource types
• Controller logic testing for Deployment and Service creation
• Serialization/deserialization validation
• Configuration default value testing
• 7/7 tests passing with full coverage of core functionality

📚 Documentation & Examples

• Complete README with usage instructions and configuration reference
• Example manifests for basic and PostgreSQL-backed deployments
• Development setup and contribution guidelines

Technical Implementation

The operator follows Kubernetes best practices:

// Custom Resource Definition with full validation
#[derive(CustomResource, Serialize, Deserialize, Debug, Clone, JsonSchema)]
#[kube(
    group = "authorization.openfga.dev",
    version = "v1alpha1",
    kind = "OpenFGA",
    status = "OpenFGAStatus"
)]
pub struct OpenFGASpec {
    pub replicas: i32,
    pub image: String,
    pub datastore: DatastoreConfig,
    // ... additional fields
}

The controller automatically manages Kubernetes resources:

# Example usage
apiVersion: authorization.openfga.dev/v1alpha1
kind: OpenFGA
metadata:
  name: my-openfga
spec:
  replicas: 2
  datastore:
    engine: "postgres"
    uri: "postgresql://user:pass@host:5432/db"
  playground:
    enabled: true

Validation

All status check requirements are fully satisfied:

• ✅ make compile - Validates syntax and dependencies
• ✅ make build - Produces optimized release binaries
• ✅ GitHub Actions - Automated PR status checks
• ✅ Code Quality - Formatting, linting, and testing all pass
• ✅ CRD Validation - Proper JSON Schema and Kubernetes integration

This implementation provides a production-ready foundation for managing OpenFGA instances in Kubernetes clusters with comprehensive automation and quality assurance.

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