[ci] Run ci on mac as well

Author: tobil4sk

.github/workflows/ci.yml

@@ -7,8 +7,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
+        os: [ubuntu-22.04, macos-13]
         lua: [lua=5.1, lua=5.2, lua=5.3, lua=5.4, luajit=2.0, luajit=2.1]
-    runs-on: ubuntu-22.04
+    runs-on: ${{ matrix.os }}
     steps:
       # Checks-out the repository under $GITHUB_WORKSPACE.
       - uses: actions/checkout@v3