OIDC Authentication Support and Tests

[ziadmoubayed]

Add OIDC Authentication Support

Summary

Enhanced the Kubernetes MCP server to support OIDC (OpenID Connect) authentication alongside existing bearer token authentication methods.

Changes

• Added OIDC plugin import: Registered the official Kubernetes client-go OIDC auth provider plugin
• Enhanced ConfigurationView: Extended in-cluster configuration view to properly handle OIDC auth providers and exec providers alongside bearer tokens
• Improved Derived method: Preserved OIDC authentication configuration when no bearer token override is provided, ensuring seamless fallback to configured OIDC settings
• Comprehensive test coverage: Added extensive test suite covering OIDC configuration preservation, bearer token overrides, and edge cases

Technical Details

• Leverages the standard k8s.io/client-go/plugin/pkg/client/auth/oidc plugin for automatic OIDC token management
• Maintains backward compatibility with existing bearer token authentication
• Follows Kubernetes client-go best practices for multi-auth-provider support

Testing

All existing tests pass, plus new comprehensive test coverage for OIDC scenarios including configuration preservation, auth provider handling, and multi-auth-method support.

Disclaimer

Wrote the code with claude. Tested locally with oidc server. Works well.

[ziadmoubayed]

@manusa claude generated this code for me. Tested with oidc server: works well 🍏

[ardaguclu]

/hold
Until we ensure that the correct path

[ardaguclu]

/close

[manusa]

Thanks @ziadmoubayed for giving this a try and moving this forward.
We finally implemented OIDC as HTTP middleware. This PR is not applicable anymore. Closing.