v2.1.0 - OAuth2 Token Authentication

New Features:
- OAuth2 token authentication support (preferred method)
- Backward compatible with username/password authentication

Improvements:
- Enhanced authentication validation
- Better secret masking for sensitive values
- Improved logging with core.info() and core.warning()
- Refactored code structure for better maintainability
- Comprehensive test coverage

Documentation:
- Updated README with authentication examples
- Added workflow template example

v2.0.0 - Security & Modernization Release

Publish new version with branding icon

Dist binary build