chore(ci): Don't pull zfs on latest. #957

Job	Run time
build / image (main, bluefin, latest)	11m 39s
build / image (main, bluefin-dx, latest)	17m 40s
build / image (nvidia, bluefin, latest)	14m 43s
build / image (nvidia, bluefin-dx, latest)	18m 25s
build / image (asus, bluefin, latest)	37s
build / image (asus, bluefin-dx, latest)	37s
build / image (asus-nvidia, bluefin, latest)	32s
build / image (asus-nvidia, bluefin-dx, latest)	1m 8s
build / image (surface, bluefin, latest)	36s
build / image (surface, bluefin-dx, latest)	34s
build / image (surface-nvidia, bluefin, latest)	34s
build / image (surface-nvidia, bluefin-dx, latest)	39s
build / Check all bluefin latest builds successful	3s
build / iso	0s
	1h 7m 47s

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