add step to list available simulators to help troubleshoot failing tests

Author: rui-mendes-95

.github/workflows/continuous_integration.yml

@@ -26,6 +26,9 @@ jobs:
 
       - name: Set up XCode 
         run: sudo xcode-select --switch /Applications/Xcode_15.0.app
+
+      - name: List available simulators
+        run: xcrun simctl list devices
 
       - name: Bundle Install
         run: bundle install