appimage: package QT platforms

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[...] maybe all you need to do instead is run hotspot -platform offscreen ... or QT_QPA_PLATFORM=offscreen hotspot ... instead?

[...] the first test did not worked out

qt.qpa.plugin: Could not find the Qt platform plugin "offscreen" in ""

This is with the appimage I guess? Packaging problem - could be solved there.

Originally posted by @milianw in https://github.com/KDAB/hotspot/issues/549#issuecomment-1803391337

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Rechecked with current appimage:

QT_QPA_PLATFORM=banana ./hotspot-v1.4.1-286-g385bbcd-x86_64.AppImage
qt.qpa.plugin: Could not find the Qt platform plugin "banana" in ""
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: xcb.

So it looks like only xcb is packaged.