Build and test

Create release notes markdown output for `diff` command #1814

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Run time

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Job	Run time
lint (3.9)	30s
test (ubuntu-latest, 3.9)	37m 17s
lint (3.10)	25s
test (ubuntu-latest, 3.10)	38m 10s
test (windows-latest, 3.10)	40m 59s
	1h 57m 21s