Update CI workflow to include macOS support

Add conditional environment variable for macOS builds.

Author: epernod

.github/workflows/ci.yml

@@ -19,6 +19,11 @@ on:
         default: false
         type: boolean
 
+env:
+  RUN_MACOS: ${{ !(github.event_name == 'pull_request' ||
+    (github.event_name == 'push' && !startsWith(github.ref, 'refs/tags/v')) ||
+    (github.event_name == 'workflow_dispatch' && inputs.full_build != 'true')) }}
+    
 jobs:
   build-and-test:
     name: Run on ${{ matrix.os }} with SOFA ${{ matrix.sofa_branch }} / MeshRefinement=${{ matrix.with_mesh_refinement }}
@@ -42,7 +47,9 @@ jobs:
       fail-fast: false
 
       matrix:
-        os: [ubuntu-22.04, windows-2022]
+        os: ${{ fromJSON(env.RUN_MACOS == 'true'
+          && '["ubuntu-22.04","windows-2022","macos-14"]'
+          || '["ubuntu-22.04","windows-2022"]') }}
 
         sofa_branch: [master]
         with_mesh_refinement: [ON, OFF]