Description

This PR extends the Linux updater functionality to support .deb package updates alongside the existing AppImage support. The implementation includes multiple authentication methods for package installation, providing a user-friendly update experience for Debian-based distributions.

Key Features

• Support for both .deb packages and AppImage updates
• Multiple privilege escalation methods:

1. pkexec (primary, graphical)
2. zenity for GUI password prompt
3. Terminal-based sudo as fallback

• Automatic detection of installation type (AppImage vs .deb)
• Secure handling of authentication and package installation

Technical Details

• Added new error types for authentication and installation failures
• Implemented .deb package extraction from both direct files and tar.gz archives
• Added helper methods for privilege escalation and authentication
• Maintained backward compatibility with existing AppImage functionality

Expected Archive Structures

├── [AppName]_[version]_amd64.AppImage.tar.gz
│   └──[AppName]_[version]_amd64.AppImage
├── [AppName]_[version]_amd64.deb.tar.gz
│   └──[AppName]_[version]_amd64.deb
├── [AppName]_[version]_amd64.deb
└── ...

Testing

• Tested on Debian-based distributions
• Verified both .deb and AppImage update paths
• Tested various authentication scenarios

Notes

• Requires zenity for graphical password prompt (optional)
• Falls back to terminal-based authentication if graphical methods fail
• Maintains security by properly handling sensitive authentication data