Build and test

Create release notes markdown output for `diff` command #1830

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Run time

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Job	Run time
lint (3.9)	29s
lint (3.10)	31s
test (ubuntu-latest, 3.9)	36m 44s
test (ubuntu-latest, 3.10)	37m 1s
test (windows-latest, 3.10)	41m 29s
	1h 56m 14s