Build and test

Create release notes markdown output for `diff` command #1807

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Job	Run time
lint (3.9)	27s
lint (3.10)	26s
test (ubuntu-latest, 3.9)	37m 54s
test (ubuntu-latest, 3.10)	37m 55s
test (windows-latest, 3.10)	41m 18s
	1h 58m 0s