refactor: main and hci now follow common patterns (#81) #366

Job	Run time
Get CoreOS versions	6s
Get Build Info	3s
Build uCore (ucore, stable, -zfs)	3m 29s
Build CoreOS ZFS (fedora-coreos-zfs, stable)	3m 20s
Build uCore (ucore, stable)	3m 0s
Build CoreOS ZFS (fedora-coreos-zfs, testing)	3m 3s
Build uCore (ucore, testing, -zfs)	3m 46s
Build uCore (ucore, testing)	3m 18s
Build HCI (ucore, stable, -zfs)	3m 24s
Build HCI (ucore, stable)	4m 3s
Build HCI (ucore, testing, -zfs)	3m 20s
Build HCI (ucore, testing)	3m 15s
	34m 7s

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