Push/pull doesn't work under Flatpak as expected
The push/pull methods don't work under Flatpak for locations that are not accessible from the host. Or even worse a completely different file can be copied/moved. See: https://github.com/flathub/org.libreoffice.LibreOffice/issues/23. We should probably disable push/pull under Flatpak for this reason, is there any simple way how to detect we are under Flatpak? Or any other ideas? @alexl @debarshir?