Replace deprecated script with gradlew #690

Job	Run time
build (cfi-tests, 8)	8m 15s
build (cfi-tests, 11)	9m 34s
build (cfi-tests, 17)	9m 27s
build (downstream-ontology, 8)	8m 22s
build (downstream-ontology, 11)	9m 47s
build (downstream-ontology, 17)	9m 47s
build (downstream-security-demo, 8)	8m 55s
build (downstream-security-demo, 11)	8m 44s
build (downstream-security-demo, 17)	8m 47s
build (downstream-universe, 8)	5m 30s
build (downstream-universe, 11)	6m 13s
build (downstream-universe, 17)	6m 25s
	1h 39m 46s

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