set default environment variables in the CI

alpaka-group / alpaka

Abstraction Library for Parallel Kernel Acceleration :llama:

https://alpaka.readthedocs.io

Mozilla Public License 2.0

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Closed SimeonEhrig closed 2 days ago

SimeonEhrig commented 3 days ago

If a required environment variable is not set via job description, set a default value to get a well defined state.
Implement only basic mechanism to set default environment variables, because I expect problems for some variables, which requires extra bug fixes.
Set CMAKE_CXX_EXTENSIONS=ON (default of CMake if not set)
Print environment variables also in GitHub Actions jobs.