Build release artifacts

Add final task to announce the release #121

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Run time

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Job	Run time
verify-input	16s
build-source	1m 16s
build-docs	5m 31s
build-android (x86_64)	22m 45s
build-android (aarch64)	4m 48s
test-source	30m 1s
	1h 4m 37s