add MPIPreferences to intel test

Author: vchuravy

.github/workflows/UnitTests.yml

@@ -522,6 +522,12 @@ jobs:
           ${{ runner.os }}-test-
           ${{ runner.os }}-
 
+    - name: add MPIPreferences
+      shell: julia --color=yes --project=. {0}
+      run: |
+        using Pkg
+        Pkg.develop(path="lib/MPIPreferences")
+
     # We can't use the usual actions here as we need to ensure the environment variables are set
     - name: "Build package"
       run: |