Add GPU benchamrks to the CI

Author: vinser52

.github/workflows/gpu.yml

@@ -88,3 +88,7 @@ jobs:
       - name: Run examples
         working-directory: ${{github.workspace}}/build
         run: ctest --output-on-failure --test-dir examples -C ${{env.BUILD_TYPE}}
+
+      - name: Run benchmarks
+        working-directory: ${{github.workspace}}/build
+        run: ctest --output-on-failure --test-dir benchmark -C ${{env.BUILD_TYPE}} --exclude-regex umf-bench-multithreaded