Revert "openmpi: Do not create PRRTE configuration file"

This reverts commit c7adac1.

Author: dalcinl

.github/workflows/openmpi.yml

@@ -103,6 +103,8 @@ jobs:
         echo mpi_param_check = true >> "$mca_params"
         echo mpi_show_handle_leaks = true >> "$mca_params"
         echo rmaps_base_oversubscribe = true >> "$mca_params"
+        mca_params="$HOME/.prte/mca-params.conf"
+        mkdir -p "$(dirname "$mca_params")"
         echo rmaps_default_mapping_policy = :oversubscribe >> "$mca_params"
 
     - name: Show MPI