Exercises check

Add `line-up` exercise (#4074) #4284

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Run time

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Job	Run time
housekeeping	49s
canonical_sync (3.7)	50s
canonical_sync (3.9)	50s
canonical_sync (3.10.6)	50s
canonical_sync (3.11.2)	45s
canonical_sync (3.8)	50s
	4m 54s