Conditionally run CUDA tests on GPU runners

Skip CUDA unit test execution when the runner has no CUDA-capable GPU, while still running tests when GPU is available.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: utilForever

.github/workflows/ubuntu-cuda.yml

@@ -58,4 +58,9 @@ jobs:
     - name: Build
       run: cd build && make
     - name: Run CUDA Unit Test
-      run: /home/runner/work/CubbyFlow/CubbyFlow/build/bin/CUDATests
+      run: |
+        if command -v nvidia-smi >/dev/null 2>&1 && nvidia-smi -L >/dev/null 2>&1; then
+          /home/runner/work/CubbyFlow/CubbyFlow/build/bin/CUDATests
+        else
+          echo "No CUDA-capable GPU detected on runner. Skipping CUDA unit tests."
+        fi

.github/workflows/windows-cuda.yml

@@ -84,4 +84,14 @@ jobs:
       run: MSBuild.exe "build\\${{ matrix.solution }}" /p:Configuration=Release
     - name: Run CUDA Unit Test
       shell: powershell
-      run: /a/CubbyFlow/CubbyFlow/build/bin/Release/CUDATests.exe
+      run: |
+        $nvidiaSmi = Get-Command "nvidia-smi.exe" -ErrorAction SilentlyContinue
+        if ($null -ne $nvidiaSmi) {
+          & nvidia-smi.exe -L | Out-Host
+          if ($LASTEXITCODE -eq 0) {
+            & /a/CubbyFlow/CubbyFlow/build/bin/Release/CUDATests.exe
+            exit $LASTEXITCODE
+          }
+        }
+
+        Write-Host "No CUDA-capable GPU detected on runner. Skipping CUDA unit tests."