Test pipeline

Document how to install prerequisites in examples READMEs (#1993) #1211

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Run time

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Job	Run time
test (3.8)	3m 27s
test (3.9)	1m 38s
test (3.10)	1m 44s
test (3.11)	2m 9s
test (3.12)	1m 56s
finish-coveralls	4s
	10m 58s