[Rpm-maint] [rpm-software-management/rpm] Add a man page for rpm sysusers integration (PR #4126)

[Michal Domonkos]

@dmnks commented on this pull request.



> +invoke the *%\_\_systemd_sysusers* binary (typically *systemd-sysusers*(8)) with
+the correct arguments in order to create the user and/or group accounts when the
+package is installed. This is the recommended method on systemd native platforms
+and requires no intervention from the package beyond shipping those files.
+
+RPM also allows for declaring sysusers.d entries explicitly in the spec file
+with the *%add_sysuser* macro. This macro takes a sysusers.d line with its
+fields passed as separate arguments and must be declared in the (sub-)package
+context. This method is primarily intended for platforms without systemd where
+it is typically also coupled with a custom *%\_\_systemd_sysusers* binary (see
+*DECODING* for details).
+
+Note that for certain types of systemd services (for example, transient or
+socket activated), it may be possible to avoid package level user and group
+allocation altogether by using Dynamic Users (see *DynamicUser=* in
+*systemd.exec*(5) and the URL in *SEE ALSO* for details).

Yep, man pages are inherently local and so when writing/converting some documentation to it, you're naturally drawn towards finding man page references for things like this. And voila, there it is, in systemd.exec(5) :smile: 

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