Workaround infrastructure issues with Flatpak

After migrating to a new server, the installation of Flatpak apps fail with:

Signature verification enabled, but no summary signatures found(use gpg-verify-summary=false and/or sign-verify-summary=false in remote config to disable)

causing HMI image not being built. To workaround this issue disable the installation of Flatpak apps.

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