Hooray!
Now for the bad. Something has changed in a images of MacOs environments. Looking for users of this operating system. Yo need in file
https://github.com/urho3d/Urho3D/blob/master/.github/workflows/main.yml
replace
run: sudo xcode-select -s '/Applications/Xcode_12.app'
to something from this
https://github.com/actions/virtual-environments/tree/main/images/macos
and force the engine to compile. Otherwise, we will not be able to guarantee support for MacOS.