Build release artifacts

Add Savannah for 3.16 and 3.17 #60

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Run time

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Job	Run time
verify-input	10s
build-source	1m 19s
build-docs	16m 39s
build-android (aarch64)	5m 49s
build-android (x86_64)	19m 56s
test-source	28m 21s
	1h 12m 14s