Update mulle-sde-ci.yml

Author: mulle-nat

.github/workflows/mulle-sde-ci.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ ubuntu-latest]
+        os: [ ubuntu-latest, macos-latest, macos-14 ]
 
     steps:
     - name: Set MULLE_HOSTNAME