ci: add debugging output to diagnose ubuntu test hang

Author: Nucs

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

@@ -52,9 +52,12 @@ jobs:
       shell: bash
       timeout-minutes: 10
       run: |
+        echo "Starting test run..."
+        echo "dotnet version: $(dotnet --version)"
+        echo "Available memory: $(free -h 2>/dev/null || echo 'N/A')"
         dotnet run --project test/NumSharp.UnitTest/NumSharp.UnitTest.csproj \
           --configuration Release --no-build --framework net10.0 \
-          -- --treenode-filter '/*/*/*/*[Category!=OpenBugs]&/*/*/*/*[Category!=HighMemory]' --report-trx --maximum-parallel-tests 1
+          -- --treenode-filter '/*/*/*/*[Category!=OpenBugs]&/*/*/*/*[Category!=HighMemory]' --report-trx
 
     - name: Upload Test Results
       uses: actions/upload-artifact@v4