feat: create ucore builds with and without ZFS (#61) #274

Job	Run time
Get CoreOS versions	10s
Get Build Info	1s
Build CoreOS ZFS (fedora-coreos-zfs, stable)	2m 51s
Build CoreOS ZFS (fedora-coreos-zfs, testing)	3m 13s
Build uCore (ucore, stable, false)	2m 44s
Build uCore (ucore, stable, true)	2m 53s
Build uCore (ucore, testing, false)	3m 22s
Build uCore (ucore, testing, true)	3m 18s
Build HCI (ucore, stable, false)	3m 1s
Build HCI (ucore, stable, true)	4m 50s
Build HCI (ucore, testing, false)	4m 5s
Build HCI (ucore, testing, true)	3m 20s
	33m 48s

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