feat: Add initramfs generation #103

Job	Run time
build / image (main, aurora, 39)	6m 25s
build / image (main, aurora-dx, 39)	10m 31s
build / image (nvidia, aurora, 39)	6m 25s
build / image (nvidia, aurora-dx, 39)	9m 27s
build / image (asus, aurora, 39)	6m 7s
build / image (asus, aurora-dx, 39)	10m 10s
build / image (asus-nvidia, aurora, 39)	7m 6s
build / image (asus-nvidia, aurora-dx, 39)	10m 54s
build / image (framework, aurora, 39)	6m 2s
build / image (framework, aurora-dx, 39)	9m 17s
build / image (surface, aurora, 39)	7m 40s
build / image (surface, aurora-dx, 39)	9m 15s
build / image (surface-nvidia, aurora, 39)	6m 51s
build / image (surface-nvidia, aurora-dx, 39)	11m 31s
build / Check all aurora 39 builds successful	1s
build / iso	0s
	1h 57m 42s

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