Build release artifacts

Add a `SECURITY.md` with reporting guidelines (#420) #579

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Run time

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Job	Run time
verify-input	13s
build-source	1m 11s
build-android (aarch64)	3m 58s
build-android (x86_64)	20m 9s
build-docs	6m 24s
build-iOS	32m 29s
test-source	10m 59s
test-docs	38s
	1h 16m 1s