ci : use ninja and fix caching for windows-cublas (#2910)
This commit updates the windows-cublas job to use Ninja as the build
system instead of msbuild/msvc.
The motivation for this is that msbuild/mscv does not seem to handle
ccache/sccache well, for example it ignores the
`CMAKE_C_COMPILER_LAUNCHER` etc. variables. But using Ninja as the build
caching works and the build is initially the same speed as it is
currently (without caching) subsequently builds are much faster.
overview / pkg / ggml / sources / whisper.cpp / commit