workflows: Add vLLM workflow for LLM serving #21

Job	Run time
Build kdevops Container (fedora)	1m 28s
Build kdevops Container (debian)	2m 41s
Build kdevops Container (opensuse)	1m 56s
Linux A/B Tests (debian)	1m 13s
Linux A/B Tests (opensuse)	49s
Quick Config Tests (blktests_nvme) on opensuse	49s
Linux A/B Tests (fedora)	44s
Quick Config Tests (xfs_reflink_4k) on fedora	42s
Quick Config Tests (linux-ab-testing) on opensuse	54s
Quick Config Tests (lbs-xfs) on fedora	44s
Quick Config Tests (xfs_reflink_4k) on debian	56s
Quick Config Tests (blktests_nvme) on fedora	52s
Quick Config Tests (lbs-xfs) on opensuse	51s
Quick Config Tests (lbs-xfs) on debian	55s
Quick Config Tests (blktests_nvme) on debian	52s
Quick Config Tests (linux-ab-testing) on debian	53s
Quick Config Tests (xfs_reflink_4k) on opensuse	50s
Quick Config Tests (linux-ab-testing) on fedora	44s
	18m 53s

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