Build and Test

Adopt `binderhub` #124

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Run time

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Job	Run time
Build tljh_repo2docker	1m 32s
Isolated tests	1m 8s
Integration tests	19m 15s
Unit tests (3.8)	11m 24s
Unit tests (3.9)	11m 19s
Unit tests (3.10)	11m 51s
	56m 29s