test in macos to verify filesystem differences

Author: James Santucci

.github/workflows/ci.yml

@@ -12,7 +12,10 @@ on:
 jobs:
   test:
     if: "!contains(github.event.head_commit.message, 'skip ci')"
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [macos-latest, ubuntu-latest]
     steps:
       - name: Checkout project (pull-request)
         if: github.event_name == 'pull_request'