Gradle Tests

Make the signing key optinal `jf release-bundle-create` #2825

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Run time

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Job	Run time
ubuntu-gradle-5.6.4	3m 13s
ubuntu-gradle-8.3	3m 47s
windows-gradle-5.6.4	11m 30s
windows-gradle-8.3	8m 48s
macos-gradle-5.6.4	8m 4s
macos-gradle-8.3	7m 55s
	43m 17s