feat: create ucore builds with and without ZFS #270

Job	Run time
Get CoreOS versions	3s
Get Build Info	1s
Build uCore (ucore, stable, false, pr-61-)	2m 54s
Build uCore (ucore, stable, true, pr-61-)	3m 1s
Build uCore (ucore, testing, false, pr-61-)	3m 17s
Build uCore (ucore, testing, true, pr-61-)	3m 51s
Build CoreOS ZFS (fedora-coreos-zfs, stable, pr-61-)	3m 16s
Build CoreOS ZFS (fedora-coreos-zfs, testing, pr-61-)	3m 49s
Build HCI (ucore, stable, false, pr-61-)	3m 14s
Build HCI (ucore, stable, true, pr-61-)	3m 25s
Build HCI (ucore, testing, false, pr-61-)	4m 33s
Build HCI (ucore, testing, true, pr-61-)	3m 46s
	35m 10s

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