feat: 512mb alignment #299

Job	Run time
live-iso (x86_64, flagship/flagship-live)	53s
image (x86_64, base/base-disk)	4m 32s
live-iso (x86_64, gnome/gnome-live)	1s
image (x86_64, flagship/base-disk)	4m 33s
live-iso (x86_64, kde/kde-live)	4m 44s
image (x86_64, gnome/base-disk)	4m 35s
live-iso (x86_64, xfce/xfce-live)	1s
image (x86_64, kde/base-disk)	4m 35s
live-iso (aarch64, flagship/flagship-live)	1s
image (x86_64, xfce/base-disk)	3m 18s
live-iso (aarch64, gnome/gnome-live)	1s
image (aarch64, base/base-disk)	1s
live-iso (aarch64, kde/kde-live)	1s
image (aarch64, flagship/base-disk)	1s
live-iso (aarch64, xfce/xfce-live)	1s
image (aarch64, gnome/base-disk)	1s
image (aarch64, kde/base-disk)	1s
image (aarch64, xfce/base-disk)	1s
push-image	1s
	27m 22s

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