Hello,

this patch adds the service for the fwupd package (commit 23152ff70f0ed4966d8207846f54c793d7cb4f86).

Also the Gnome Shell provides nice GUI integration as shown in the attached screenshot.

The package in the service configuration is there so users can choose the fwupd they want to use as the
one in Guix upstream does not support non-libre firmware.

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Petr