Build and test

Create release notes markdown output for `diff` command #1850

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Run time

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Job	Run time
lint (3.9)	31s
lint (3.9)	31s
test (ubuntu-latest, 3.9)	36m 49s
test (ubuntu-latest, 3.9)	36m 49s
lint (3.10)	28s
lint (3.10)	28s
test (ubuntu-latest, 3.10)	36m 50s
test (ubuntu-latest, 3.10)	36m 50s
test (windows-latest, 3.10)	41m 20s
test (windows-latest, 3.10)	44m 46s
	3h 55m 22s