Workaroudn ostree push issues

Due to an issue the ostree push the stage is failing, preventing test generation to run. To at least being able to test the other aspects of the images decouple this dependency.

For same reasons disable the installation of Flatpak apps.

https://phabricator.apertis.org/T9869

Signed-off-by: Walter Lozano walter.lozano@collabora.com