Build release artifacts

Add 3.15 to Sigstore list #59

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Run time

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Job	Run time
verify-input	11s
build-source	1m 15s
build-docs	16m 41s
build-android (x86_64)	20m 42s
build-android (aarch64)	4m 20s
test-source	28m 26s
	1h 11m 35s