When running the installation image off a DVD, early I/O operations are
extremely slow, to the point that something like dbus-daemon would need
~20s to start. This change works around the issue.
Fixes <https://bugs.gnu.org/40572>.
Reported by Florian Pelz <pelzflorian@pelzflorian.de>.
* gnu/services/shepherd.scm (shepherd-configuration-file): Set
%pid-file-timeout to 30.