Merge pull request #643 from andyfinnell/allow-warnings-on-release #359

Job	Run time
example-spm-xcode	1m 13s
Carthage	11m 34s
CocoaPods	4m 36s
Analyze (iOS Simulator,name=iPhone 15)	1m 0s
swift-package-manager	27s
Test (iOS Simulator,name=iPhone 15)	3m 36s
	22m 26s

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