CI: test with Ninja
This switches the CMake tests for GCC and NVHPC to the Ninja backend.
It looks like CMake+Ninja does not support NAG. However, an extra command line for cmake might work around that.
Depends on !50 (merged).
This switches the CMake tests for GCC and NVHPC to the Ninja backend.
It looks like CMake+Ninja does not support NAG. However, an extra command line for cmake might work around that.
Depends on !50 (merged).