Portal frontend service to flatpak.
For EL7:
cd '/etc/yum.repos.d/'
curl 'https://copr.fedorainfracloud.org/coprs/scx/flatpak/repo/epel-7/scx-flatpak-epel-7.repo' > 'scx-flatpak-epel-7.repo'
This is a companion discussion topic for the original entry at https://copr.fedorainfracloud.org/coprs/scx/xdg-desktop-portal/