Build documentation #1585

Job	Run time
build-documentation (master)	32m 1s
build-documentation (release-2.0)	17m 16s
build-documentation (release-2.1)	16m 20s
build-documentation (release-2.2)	15m 56s
build-documentation (release-1.19)	19m 53s
build-documentation (release-1.20)	20m 19s
	2h 1m 45s

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