ci: disable artifact compression (they're already compressed) #371

Job	Run time
live-iso (x86_64, flagship/flagship-live)	21m 46s
image (x86_64, base/base-disk)	22s
live-iso (x86_64, gnome/gnome-live)	2m 50s
image (x86_64, flagship/base-disk)	31m 18s
live-iso (x86_64, kde/kde-live)	1h 18m 48s
image (x86_64, gnome/base-disk)	2m 17s
live-iso (x86_64, xfce/xfce-live)	22m 27s
image (x86_64, kde/base-disk)	16m 1s
live-iso (aarch64, flagship/flagship-live)	33m 44s
image (x86_64, xfce/base-disk)	32m 59s
live-iso (aarch64, gnome/gnome-live)	15m 35s
image (aarch64, base/base-disk)	1h 3m 15s
live-iso (aarch64, kde/kde-live)	34m 22s
image (aarch64, flagship/base-disk)	1h 3m 54s
live-iso (aarch64, xfce/xfce-live)	1h 3m 53s
image (aarch64, gnome/base-disk)	22m 18s
image (aarch64, kde/base-disk)	1h 4m 21s
image (aarch64, xfce/base-disk)	26m 25s
push-image	0s
	9h 56m 35s

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