Regression tests

Add script to set up IntelliJ IDEA. #432

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Run time

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Job	Run time
build-win (11)	14m 21s
build-win (21)	14m 3s
build (21, macos-latest)	4m 37s
build (11, ubuntu-latest)	4m 40s
build (11, macos-latest)	5m 7s
build (21, ubuntu-latest)	4m 9s
	46m 57s