Minor test by adding oversubscribe

Author: rohanbabbar04

.github/workflows/build.yml

@@ -42,5 +42,10 @@ jobs:
           if [ -f requirements.txt ]; then pip install -r requirements-dev.txt; fi
       - name: Install pylops-mpi
         run: pip install .
+      - name: Debug MPI Execution
+        run: |
+          echo "Starting MPI test"
+          mpiexec --oversubscribe -n 9 hostname
+          echo "MPI test completed"
       - name: Testing using pytest-mpi
         run: mpiexec -n ${{ matrix.rank }} pytest tests/ --with-mpi