Build release artifacts

Add final task to announce the release (#297) #122

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Run time

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Job	Run time
verify-input	16s
build-docs	5m 30s
build-source	1m 20s
build-android (x86_64)	20m 49s
build-android (aarch64)	4m 35s
test-source	27m 50s
	1h 0m 20s