- Created preinst script to stop wssshd service before upgrade
- Modified postinst script to restart service if it was running before upgrade
- Added proper state tracking using /tmp/wsssh-server-upgrade-state file
- Ensures zero-downtime upgrades by handling PyInstaller binary file locks
- Updated README.md to document the automatic upgrade handling
- Prevents 'file in use' errors during package upgrades
- Maintains service continuity across upgrades