Let make install do it's thing, it's more reasonable on macos and let's only archive that.

.gitlab-ci.yml

@@ -41,7 +41,7 @@ MacOS:
     - CI/before_install.osx.sh
     - CI/before_script.osx.sh
     - cd build; make -j2
-    - DESTDIR=artifacts make install
+    - make install
   artifacts:
     paths:
-      - build/artifacts/
+      - /usr/local/OpenMW.app