fio-tests: add comprehensive filesystem testing documentation #98

Job	Run time
Build kdevops Container (debian)	2m 5s
Build kdevops Container (fedora)	1m 46s
Build kdevops Container (opensuse)	2m 2s
Linux A/B Tests (debian)	1m 1s
Linux A/B Tests (fedora)	44s
Linux A/B Tests (opensuse)	57s
Quick Config Tests (blktests_nvme) on fedora	45s
Quick Config Tests (xfs_reflink_4k) on fedora	49s
Quick Config Tests (blktests_nvme) on opensuse	53s
Quick Config Tests (xfs_reflink_4k) on opensuse	50s
Quick Config Tests (xfs_reflink_4k) on debian	49s
Quick Config Tests (lbs-xfs) on debian	49s
Quick Config Tests (linux-ab-testing) on fedora	43s
Quick Config Tests (linux-ab-testing) on debian	50s
Quick Config Tests (lbs-xfs) on fedora	43s
Quick Config Tests (lbs-xfs) on opensuse	51s
Quick Config Tests (linux-ab-testing) on opensuse	49s
Quick Config Tests (blktests_nvme) on debian	48s
	18m 14s

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