Build release artifacts

Only set group and permissions on downloads dir if needed #494

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Run time

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Job	Run time
verify-input	12s
build-iOS	30m 21s
build-android (aarch64)	4m 41s
build-source	1m 23s
build-android (x86_64)	19m 11s
build-docs	5m 49s
test-source	10m 27s
test-docs	41s
	1h 12m 45s