Draft: Adapt flatpak to GTK4 + libadwaita
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--device=dri This is needed since GTK4 uses DRI and otherwise one gets warnings like: 'libEGL warning: DRI2: could not open /dev/dri/card0'
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"build-args" : [ "--share=network" ] This is needed since the build of libadwaita wants to fetch some more dependencies from the network like 'https://github.com/lazka/sassc.git/'
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libadwaita 1.1.0 vs 1.1.0, currently 1.0.0-alpha is the latest