Test pipeline

Document how to install prerequisites in examples READMEs #1182

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Run time

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Job	Run time
test (3.8)	3m 16s
test (3.9)	1m 50s
test (3.10)	1m 41s
test (3.11)	2m 23s
test (3.12)	1m 58s
finish-coveralls	5s
	11m 13s