Add macOS runners to CI workflow

Author: pgleeson

.github/workflows/omv-ci.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        runs-on: [ ubuntu-22.04] #, macos-14 
+        runs-on: [ ubuntu-22.04, macos-14, macos-latest ]
         engine:
             - jNeuroML
             - jNeuroML_NEURON