- Add linglong.yaml configuration file for Linglong package format
- Add GitHub Actions workflow for automated Linglong package building
- Support self-contained .NET deployment with shared runtime
- Follow Linglong application conventions and Freedesktop standards
This enables distribution on Deepin/UOS systems via the Linglong package
manager, providing a modern containerized application format for Linux.
Features:
- Automated build triggered on release or manual dispatch
- Shared .NET runtime between Main App and AirAppRuntime
- Proper desktop file and icon integration
- Package validation and artifact upload
