Java CI

Add `build-attestation` target #1924

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Run time

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Job	Run time
build (8, false)	1m 58s
build (25, false)	1m 46s
build (21, false)	1m 49s
build (17, false)	2m 1s
build (11, false)	2m 8s
build (26-ea, true)	1m 55s
	11m 37s