Update file name in build workflow

The file referenced in the build workflow under the run demo section has been amended. It previously named 'rayphp.php' incorrectly, this has been corrected to 'rayaop.php'. This change aligns the filename with the module name ensuring correct file is being invoked.

.github/workflows/build.yml

@@ -38,4 +38,4 @@ jobs:
       - name: Run demo
         run: |
           php -d extension=./modules/rayaop.so -i | grep rayaop
-          php -d extension=./modules/rayaop.so rayphp.php
+          php -d extension=./modules/rayaop.so rayaop.php