github: unify docker-tests and linux-ab #2

Job	Run time
Build kdevops Container (debian)	2m 33s
Build kdevops Container (fedora)	1m 36s
Build kdevops Container (opensuse)	2m 39s
Linux A/B Tests (debian)	1m 7s
Linux A/B Tests (fedora)	48s
Linux A/B Tests (opensuse)	51s
Quick Config Tests (linux-ab-testing) on debian	56s
Quick Config Tests (blktests_nvme) on fedora	41s
Quick Config Tests (xfs_reflink_4k) on opensuse	54s
Quick Config Tests (xfs_reflink_4k) on debian	58s
Quick Config Tests (lbs-xfs) on fedora	46s
Quick Config Tests (xfs_reflink_4k) on fedora	45s
Quick Config Tests (lbs-xfs) on debian	1m 4s
Quick Config Tests (blktests_nvme) on opensuse	49s
Quick Config Tests (lbs-xfs) on opensuse	49s
Quick Config Tests (linux-ab-testing) on fedora	42s
Quick Config Tests (linux-ab-testing) on opensuse	49s
Quick Config Tests (blktests_nvme) on debian	54s
	19m 41s

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