Build release artifacts

Add iOS XCframework build to release artefacts. #390

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Run time

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Job	Run time
verify-input	12s
build-source	1m 16s
build-iOS	9s
build-android (x86_64)	18m 7s
build-android (aarch64)	3m 8s
build-docs	0s
test-docs	0s
test-source	11m 8s
	34m 0s