feat: switch to readymade #477

Job	Run time
tar (x86_64, wsl/wsl)	1m 40s
live-iso (x86_64, flagship/flagship-live)	26m 51s
tar (aarch64, wsl/wsl)	1s
live-iso (x86_64, gnome/gnome-live)	26m 6s
image (x86_64, base/base-disk)	5m 48s
image (x86_64, flagship/base-disk)	8m 4s
live-iso (x86_64, plasma/plasma-live)	31m 9s
live-iso (x86_64, xfce/xfce-live)	27m 22s
image (x86_64, gnome/base-disk)	8m 11s
live-iso (x86_64, flagship/flagship-live-anaconda)	19m 47s
image (x86_64, plasma/base-disk)	8m 33s
live-iso (x86_64, gnome/gnome-live-anaconda)	18m 26s
image (x86_64, xfce/base-disk)	8m 11s
live-iso (x86_64, plasma/plasma-live-anaconda)	20m 48s
image (aarch64, base/base-disk)	1s
live-iso (x86_64, xfce/xfce-live-anaconda)	20m 17s
image (aarch64, flagship/base-disk)	1s
live-iso (aarch64, flagship/flagship-live)	1s
image (aarch64, gnome/base-disk)	1s
live-iso (aarch64, gnome/gnome-live)	1s
image (aarch64, plasma/base-disk)	1s
live-iso (aarch64, plasma/plasma-live)	1s
image (aarch64, xfce/base-disk)	1s
live-iso (aarch64, xfce/xfce-live)	1s
live-iso (aarch64, flagship/flagship-live-anaconda)	1s
live-iso (aarch64, gnome/gnome-live-anaconda)	1s
live-iso (aarch64, plasma/plasma-live-anaconda)	1s
live-iso (aarch64, xfce/xfce-live-anaconda)	1s
push-image	0s
	3h 51m 27s

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