upload swiftwinrt log on failure (#170)

.github/actions/windows-build/action.yml

@@ -41,7 +41,14 @@ runs:
  #       git diff
  #       throw "Checked in files are not up-to-date, re-run swiftwinrt before checking-in: \n$dirty"
  #     }
-
+
+  - name: Upload swiftwinrt logs on failure
+    uses: actions/upload-artifact@5d5d22a31266ced268874388b861e4b58bb5c2f3
+    if: failure()
+    with:
+      name: swiftwinrt-log
+      path: ${{ github.workspace }}\tests\test_component\swiftwinrt.log
+
   - name: Run test app
     shell: cmd
     run: .\out\${{ inputs.config }}\bin\test_app.exe