Previous to this change, GNOME users would have to manually add the
gnome-keyring-service-type to their services to have a default login keyring
created and unlocked at login time. Some applications depend on a default
keyring being available, prompt repeatedly for it, which is confusing and
doesn't match user expectations, given most distributions use the GNOME
keyring pam module to unlock the login keyring by default.
* doc/guix.texi (Desktop Services): Update doc.
* gnu/services/desktop.scm (<gnome-keyring-configuration>): Move above
gnome-desktop-service-type, and streamline description.
(pam-gnome-keyring): Return the empty list when CONFIG is #f.
(gnome-desktop-configuration) [keyring]: New field.
Change-Id: Ica26c1e1b85a038c1187edfb3ec3691fcd429641
Reviewed-by: Liliana Marie Prikler <liliana.prikler@gmail.com>