Merge topic 'cpack-appimage'

1a6dbcc9ea CPack: Add AppImage generator
9f2949bc68 ci: Add script to install appimagetool in Linux jobs
069f858f42 ci: Add patchelf and appstream to Fedora base image

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: buildbot <buildbot@kitware.com>
Merge-request: !10990