feat: switch to readymade #468

Job	Run time
image (x86_64, base/base-disk)	6m 20s
live-iso (x86_64, flagship/flagship-live)	1m 57s
tar (x86_64, wsl/wsl)	1m 46s
image (x86_64, flagship/base-disk)	1m 56s
live-iso (x86_64, gnome/gnome-live)	2m 29s
image (x86_64, gnome/base-disk)	1m 55s
tar (aarch64, wsl/wsl)	4m 29s
live-iso (x86_64, plasma/plasma-live)	1m 56s
image (x86_64, plasma/base-disk)	1m 55s
live-iso (x86_64, xfce/xfce-live)	1m 57s
image (x86_64, xfce/base-disk)	2m 13s
live-iso (aarch64, flagship/flagship-live)	4m 38s
image (aarch64, base/base-disk)	14m 16s
live-iso (aarch64, gnome/gnome-live)	4m 34s
live-iso (aarch64, plasma/plasma-live)	5m 33s
image (aarch64, flagship/base-disk)	4m 36s
image (aarch64, gnome/base-disk)	4m 29s
live-iso (aarch64, xfce/xfce-live)	5m 16s
image (aarch64, plasma/base-disk)	4m 9s
image (aarch64, xfce/base-disk)	4m 35s
push-image	0s
	1h 20m 59s

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