Spawn `connection-checker` as an unprivileged user #51

Job	Run time
build-ios (aarch64-apple-ios)	1m 34s
build-ios (aarch64-apple-ios-sim)	1m 35s
clippy-check-ios (aarch64-apple-ios)	1m 18s
clippy-check-ios (aarch64-apple-ios-sim)	1m 13s
	5m 40s

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