And also: by default, for the systemd-user service and for local sessions (i.e. those assigned to a seat): let's imply CAP_WAKE_SYSTEM for them by default. Yes, let's pass one specific capability by default to local unprivileged users. The capability services exactly once purpose: to allow system wake-up from suspend via alarm clocks, hence is relatively limited in focus. By adding this tools such as GNOME's Alarm Clock app can simply allocate a CLOCK_REALTIME_ALARM (or ask systemd --user to do this) timer and it will wake up the system as necessary. Note that systemd --user will not pass the ambient caps on by default, so even with this change, individual services need to use AmbientCapabilities= to pass this on to the individual programs. Fixes: #17564 #21382
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