Try CI with 22.04.

Author: vehre

.github/workflows/ci.yml

@@ -4,12 +4,12 @@ on: push
 
 jobs:
   Build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     strategy:
       fail-fast: true
       matrix:
-        mpi: [ 'impi' ]
-#        mpi: [ 'mpich', 'openmpi', 'impi' ]
+#        mpi: [ 'impi' ]
+        mpi: [ 'mpich', 'openmpi', 'impi' ]
 #        mpich is borken on ubuntu-24.04LTS and 24.10 see https://bugs.launchpad.net/ubuntu/+source/mpich/+bug/2072338
 #        openmpi is borken on ubuntu-24.04LTS and 24.10 see https://github.com/open-mpi/ompi/issues/10726
 #        ubuntu 24.10 is not available as github runner, so we are left with Intel's mpi for now.