added benchmark run action

Author: Petr Sramek

.github/workflows/dotnet.yml

@@ -19,10 +19,13 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v3
       with:
-        dotnet-version: 9.0.x
+        dotnet-version: 8.0.x
     - name: Restore dependencies
       run: dotnet restore
     - name: Build
       run: dotnet build --no-restore
     - name: Test
       run: dotnet test --no-build --verbosity normal
+    - name: Benchmark
+      working-directory: ./benchmarks/PolylineAlgorithm.Benchmarks
+      run: dotnet run -c Release