Gradle Tests

Make the signing key optinal `jf release-bundle-create` #2817

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Run time

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Job	Run time
ubuntu-gradle-5.6.4	3m 22s
ubuntu-gradle-8.3	3m 40s
windows-gradle-5.6.4	14m 2s
windows-gradle-8.3	8m 57s
macos-gradle-5.6.4	8m 47s
macos-gradle-8.3	7m 12s
	46m 0s