s6-supervise sends signals (e.g. SIGTERM) to the pid of the process
running "run", so how do we know if the ceanup commands are even
getting executed if the shell interpreter that is supposed to do that
got killed already?
We call s6-rc -u -p default to restart/start the base services
on a rebuild, otherwise services that are only in the new
configuration won't come up. However, this stops any service
started by a trigger. So, workaround is to restart the trigger
service and expect it to restart the services it manages if they're
needed
