Add kokoro build configuration for cmake
Add kokoro build configuration for cmake

Later, I'll rename the bazel configs so they include that in the name.

Closes https://github.com/google/iree/pull/491

COPYBARA_INTEGRATE_REVIEW=https://github.com/google/iree/pull/491 from GMNGeoffrey:kokoro-cmake 4511ebe7df4e5b1feb952fc47ad810375a930b23
PiperOrigin-RevId: 289993610

iree-org/iree,iree-org/iree,google/iree,google/iree,google/iree,google/iree,iree-org/iree,iree-org/iree,google/iree,google/iree,iree-org/iree,iree-org/iree,google/iree,iree-org/iree