Fix CI: add php command for run.php

- First script gets 'php' prefix automatically: demo/compile.php
- Second script needs explicit 'php': php demo/run.php

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Co-Authored-By: Claude <[email protected]>

Author: koriym

.github/workflows/continuous-integration.yml

@@ -11,5 +11,5 @@ jobs:
     with:
       old_stable: '["8.2", "8.3", "8.4"]'
       current_stable: 8.5
-      script: demo/compile.php && demo/run.php
+      script: demo/compile.php && php demo/run.php