Use 4 threads for cmake build and test execution. #126
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Use 4 threads for cmake build and test execution.
The GitHub public runners have 3-4 cores:
https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners/about-github-hosted-runners#standard-github-hosted-runners-for-public-repositories
This should significantly speed up CMake CI builds, which take 10-11 minutes
compared to 2-3 minutes for Bazel builds.