Add systemd helper for running headless session
Currently in gnome-remote-desktop!215 (merged) there is a systemd service template and a python script that makes it easy to run a session headlessly. It relies on X-GDM-CanRunHeadless
compatible sessions, launches it in a compatible way. Ideally this functionality would be provided by gdm and not gnome-remote-desktop, since there is nothing specific to gnome-remote-desktop in either the python script or the systemd service template. GDM also has relevant code that can be reused, instead of reinventing it in a python script.
Suggested name for the service is: gnome-headless-session@.service
.