Build and test

Create release notes markdown output for `diff` command #1837

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Run time

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Job	Run time
lint (3.9)	30s
lint (3.10)	34s
test (ubuntu-latest, 3.9)	40m 18s
test (ubuntu-latest, 3.10)	41m 11s
test (windows-latest, 3.10)	44m 37s
	2h 7m 10s