What hosted continuous integration offerings exist supporting macOS UI tests with Swift?

I'm looking for a hosting provider (like CircleCI) which supports UI tests for macOS applications written in Swift (like these). CircleCI does not, and there are not plans to with 2.0.

I know I could find a hosted Mac provider (like MacStadium) and set up XCode Server bots or similar for CI, or set up my own, but I'm hoping for something a bit more batteries-included.

Thanks!