Exercises check

Add `line-up` exercise #4283

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Run time

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Job	Run time
housekeeping	52s
canonical_sync (3.10.6)	46s
canonical_sync (3.8)	52s
canonical_sync (3.11.2)	45s
canonical_sync (3.9)	47s
canonical_sync (3.7)	50s
	4m 52s