feat: switch to readymade #481

Job	Run time
tar (x86_64, wsl/wsl)	1m 40s
image (x86_64, base/base-disk)	16m 3s
tar (aarch64, wsl/wsl)	1s
live-iso (x86_64, flagship/flagship-live)	29m 12s
image (x86_64, flagship/base-disk)	8m 19s
live-iso (x86_64, gnome/gnome-live)	29m 7s
image (x86_64, gnome/base-disk)	10m 49s
live-iso (x86_64, plasma/plasma-live)	32m 21s
image (x86_64, plasma/base-disk)	10m 49s
live-iso (x86_64, xfce/xfce-live)	29m 3s
image (x86_64, xfce/base-disk)	9m 9s
live-iso (x86_64, flagship/flagship-live-anaconda)	21m 54s
image (aarch64, base/base-disk)	1s
live-iso (x86_64, gnome/gnome-live-anaconda)	20m 33s
image (aarch64, flagship/base-disk)	1s
live-iso (x86_64, plasma/plasma-live-anaconda)	22m 17s
image (aarch64, gnome/base-disk)	1s
live-iso (x86_64, xfce/xfce-live-anaconda)	21m 57s
image (aarch64, plasma/base-disk)	1s
image (aarch64, xfce/base-disk)	1s
live-iso (aarch64, flagship/flagship-live)	1s
live-iso (aarch64, gnome/gnome-live)	1s
live-iso (aarch64, plasma/plasma-live)	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
	4h 23m 27s

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