Adopt `binderhub` #130

Job	Run time
Build tljh_repo2docker	1m 26s
Isolated tests	53s
Unit tests (3.8)	17m 0s
Integration tests (local)	10m 45s
Integration tests (binderhub)	8m 13s
Unit tests (3.9)	16m 43s
Unit tests (3.10)	16m 58s
	1h 11m 58s

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