PHP-master: opcache is no longer optional

Since PHP 8.5, opcache is no longer an optional extension to enable.

See [PHP 8.5: Opcache extension no longer optional](https://php.watch/versions/8.5/opcache-bundled)

Author: Ayesh

action.yml

@@ -270,10 +270,15 @@ runs:
           sudo chmod 777 /etc/php.d
           cd ../
 
-    - name: Enable opcache
+    - name: Install opcache
       shell: bash
+      if: inputs.branch == 'PHP-8.4'
       run: |
         echo zend_extension=opcache.so >> /etc/php.d/opcache.ini
+
+    - name: Enable opcache
+      shell: bash
+      run: |
         echo opcache.enable=1 >> /etc/php.d/opcache.ini
         echo opcache.enable_cli=1 >> /etc/php.d/opcache.ini