mpi in CI via apt-get install

Author: bernstei

.github/workflows/pytests.yml

@@ -166,11 +166,12 @@ jobs:
             python3 -m pip install .
             python3 -c "import numpy; print('numpy version', numpy.__version__)"
 
-      - name: Install QE via apt-get just to see mpi dependencies
+      - name: Install MPI based on what "apt-get install quantum-espresso" used to do
         run: |
-          sudo apt-get install --no-install-recommends quantum-espresso
+          # sudo apt-get install --no-install-recommends quantum-espresso
+          sudo apt-get install --no-install-recommends mpi-default-bin openmpi-bin openmpi-common
 
-      - name: Install Quantum Espresso
+      - name: Install Quantum Espresso from source
         run: |
           # from
           sudo apt install --no-install-recommends \