fix: conditionally enable initial-setup based on existence of GIS #274

Job	Run time
image (x86_64, base/base-disk)	10m 16s
live-iso (x86_64, flagship/flagship-live)	25m 17s
image (x86_64, flagship/base-disk)	17m 1s
live-iso (x86_64, gnome/gnome-live)	20m 31s
image (x86_64, gnome/base-disk)	17m 28s
image (x86_64, kde/base-disk)	18m 48s
live-iso (x86_64, kde/kde-live)	1h 3m 57s
image (x86_64, xfce/base-disk)	15m 19s
live-iso (x86_64, xfce/xfce-live)	23m 20s
live-iso (aarch64, flagship/flagship-live)	31m 43s
image (aarch64, base/base-disk)	28m 4s
image (aarch64, flagship/base-disk)	42m 32s
live-iso (aarch64, gnome/gnome-live)	28m 15s
image (aarch64, gnome/base-disk)	40m 1s
live-iso (aarch64, kde/kde-live)	34m 1s
image (aarch64, kde/base-disk)	41m 51s
live-iso (aarch64, xfce/xfce-live)	30m 22s
image (aarch64, xfce/base-disk)	41m 4s
push-image	1s
	8h 49m 51s

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