Run build & test steps on windows & macos if the ci/test label is set #495

Job	Run time
setup_matrix	1s
integration-tests (ubuntu-latest, 6.0.x)	9m 57s
integration-tests (ubuntu-latest, 8.0.x)	9m 41s
integration-tests (windows-latest, 6.0.x)	15m 36s
integration-tests (windows-latest, 8.0.x)	20m 13s
integration-tests (macos-11, 6.0.x)	26m 38s
integration-tests (macos-11, 8.0.x)	25m 48s
debug	0s
build	0s
check-pr	0s
	1h 47m 54s

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