Dealing with the crash of QT quick project in offscreen mode

Based on squish build qt I encountered a problem in the smoking project , When the test project is cut into off screen mode , contain qml Function page crash ;

The error stack is as follows :
```
(QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>))) [0x7fc925b3fa2b]
libqoffscreen.so(+0x14580) [0x7fc91a804580]
```

The solution is to set qml Soft rendering :

export QT_QPA_PLATFORM='offscreen'
export QMLSCENE_DEVICE='softwarecontext'

Reference resources :
https://stackoverflow.com/questions/52527672/crash-when-running-qt-application-on-ubuntu-server
https://stackoverflow.com/questions/33090346/is-there-any-way-to-use-qtwebengine-without-opengl