CI + release

Update CONTRIBUTING.md and PULL_REQUEST_TEMPLATE.md to show 'gradlew … #424

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Run time

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Job	Run time
build (ubuntu-latest, 23)	1m 59s
build (windows-latest, 23)	6m 57s
build (macOS-latest, 23)	1m 36s
build (ubuntu-latest, 17, true)	1m 47s
	12m 19s