Capture WebGPU crash dumps from Windows CI

Rerun the WebGPU suite on the Windows job with the support probe
bypassed and minidump collection enabled, uploading any crash dump as
an artifact. The step never affects job status and exists to capture
the WARP-only native fault with symbols for upstream diagnosis.

Author: JimBobSquarePants

.github/workflows/build-and-test.yml

@@ -208,6 +208,32 @@ jobs:
           SIXLABORS_TESTING_PREVIEW: True
           XUNIT_PATH: .\tests\ImageSharp.Drawing.Tests # Required for xunit
 
+      # Diagnostic capture for the WARP-only native fault: reruns the WebGPU suite with the
+      # support probe bypassed so the fault can occur, collecting crash dumps as artifacts.
+      # Never affects job status; remove once the fault is root-caused upstream.
+      - name: WebGPU WARP Diagnostic
+        if: ${{ runner.os == 'Windows' && matrix.options.sdk-preview != true }}
+        continue-on-error: true
+        timeout-minutes: 12
+        shell: pwsh
+        run: |
+          New-Item -ItemType Directory -Force warp-dumps | Out-Null
+          dotnet test tests/ImageSharp.Drawing.Tests -c Release -f ${{matrix.options.framework}} --filter "FullyQualifiedName~WebGPUDrawingBackendTests"
+        env:
+          SIXLABORS_TESTING: True
+          SIXLABORS_WEBGPU_PROBE_BYPASS: 1
+          DOTNET_DbgEnableMiniDump: 1
+          DOTNET_DbgMiniDumpType: 2
+          DOTNET_DbgMiniDumpName: ${{ github.workspace }}\warp-dumps\webgpu-crash-%p.dmp
+
+      - name: Export WebGPU Diagnostic Dumps
+        uses: actions/upload-artifact@v7
+        if: ${{ always() && runner.os == 'Windows' && matrix.options.sdk-preview != true }}
+        with:
+          name: webgpu_warp_dumps_${{ matrix.options.framework }}
+          path: warp-dumps/
+          if-no-files-found: ignore
+
       - name: Export Failed Output
         uses: actions/upload-artifact@v7
         if: failure()

tests/ImageSharp.Drawing.Tests/TestUtilities/Attributes/WebGPUFactAttribute.cs

@@ -35,8 +35,13 @@ internal static WebGPUEnvironmentError ComputeProbeResult
     /// <summary>
     /// Gets a value indicating whether WebGPU compute is supported on the current system.
     /// </summary>
+    /// <remarks>
+    /// Setting <c>SIXLABORS_WEBGPU_PROBE_BYPASS=1</c> skips the probe so diagnostic runs can
+    /// execute the suite on adapters the probe rejects, capturing native crash dumps.
+    /// </remarks>
     internal static bool IsComputeSupported
-        => ComputeProbeResult == WebGPUEnvironmentError.Success;
+        => Environment.GetEnvironmentVariable("SIXLABORS_WEBGPU_PROBE_BYPASS") == "1"
+        || ComputeProbeResult == WebGPUEnvironmentError.Success;
 
     /// <summary>
     /// Gets the skip message used when WebGPU compute is unavailable.