Build and test

Create release notes markdown output for `diff` command #1820

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Run time

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Job	Run time
lint (3.9)	28s
test (ubuntu-latest, 3.9)	35m 58s
lint (3.10)	26s
test (ubuntu-latest, 3.10)	36m 45s
test (windows-latest, 3.10)	44m 58s
	1h 58m 35s