Add test schemes to iOS workspace

Hi

I'm trying to create a runner binary for my ui tests using xcodebuild but it requires the scheme to be on the .xcworkspace.

I can do this locally by opening Xcode and adding the scheme I need but to automate this on CI the easiest way would be to have the scheme available when Buck creates the workspace.

Is this supported by Buck? Alternatively can Buck create the runner binary?

Thanks