ci: use gpgme scratch build to workaround issues
ci: use gpgme scratch build to workaround issues

Temporarily work around gpgme issues until the package gets into stable.

For more information, see:
https://src.fedoraproject.org/rpms/gpgme/pull-request/3
https://github.com/ostreedev/ostree/pull/1539

Closes: #1540
Approved by: cgwalters

GNOME/ostree,GNOME/ostree,GNOME/ostree,GNOME/ostree,GNOME/ostree