CI jobs should have a step that reports on the versions of tools being used

[dabrahams]

E.g. clang --version, cmake --version, etc. can be extremely useful for diagnosing failures and verifying exactly what has been tested.

[camio]

The output of the CMake command provides the compiler version. E.g.

-- The CXX compiler identification is AppleClang 13.0.0.13000029

I'm not sure how much value it has to use cmake --version because the specification for the virtual environments already provides this information and I have no reason to believe it is incorrectly specified.