test only in ubuntu if PR

Author: Lucashsmello

.github/workflows/run_test.yaml

@@ -22,7 +22,7 @@ jobs:
       # Fail fast to save CI resources
       fail-fast: true
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: ${{ github.event_name == 'pull_request' && fromJSON('["ubuntu-latest"]') || fromJSON('["ubuntu-latest", "macos-latest", "windows-latest"]') }}
         python-version: ${{ github.event_name == 'pull_request' && fromJSON('["3.10"]') || fromJSON('["3.10", "3.12"]') }}
 
     steps: