ci : add nvcc wrapper for sccache

Author: danbev

.github/workflows/build.yml

@@ -126,6 +126,13 @@ jobs:
           echo "SDL2_DIR=${{ github.workspace }}\SDL2-${{ matrix.sdl2_ver }}\cmake" | Out-File -FilePath $env:GITHUB_ENV -Append
           echo "${{ github.workspace }}\SDL2-${{ matrix.sdl2_ver }}\cmake" > SDL2_PATH.txt
 
+      - name: Create nvcc wrapper for sccache
+        shell: cmd
+        run: |
+          echo @echo off > nvcc-sccache.bat
+          echo sccache "%CUDA_PATH%\bin\nvcc.exe" %%* >> nvcc-sccache.bat
+          echo set CUDA_NVCC_EXECUTABLE=%CD%\nvcc-sccache.bat >> %GITHUB_ENV%
+
       - name: Configure CMake
         shell: cmd
         run: |
@@ -136,6 +143,7 @@ jobs:
             -DGGML_CUDA=${{ matrix.cublas }} ^
             -DCMAKE_CUDA_ARCHITECTURES=all  ^
             -DWHISPER_SDL2=${{ matrix.sdl2 }} ^
+            -DCMAKE_CUDA_COMPILER="%CD%\nvcc-sccache.bat" ^
             -DCMAKE_CUDA_COMPILER_LAUNCHER=sccache ^
             -DCMAKE_C_COMPILER_LAUNCHER=sccache ^
             -DCMAKE_CXX_COMPILER_LAUNCHER=sccache ^