test on ubuntu, windows, and macos

Author: jonathan343

.github/workflows/ci.yml

@@ -17,6 +17,7 @@ jobs:
       fail-fast: false
       matrix:
         python-version: ["3.12", "3.13", "3.14"]
+        os: [ubuntu-latest, macOS-latest, windows-latest]
 
     steps:
       - name: Checkout Repository