rpm-ostree: support rpm provides search
I was trying
gnome-software --search=application/vnd.flatpak.ref
on Fedora Atomic Workstation, and it gives "No Application found", despite:
$ gio mime application/vnd.flatpak.ref Default application for “application/vnd.flatpak.ref”: gnome-software-local-file.desktop
and $ rpm -q --whatprovides mimehandler(application/vnd.flatpak.ref) gnome-software-3.28.0-3.fc29.x86_64
Kalev says that this is the result of g-s not supporting rpm provides search on rpm-ostree