infra: Tweak opcache settings to improve caching.

Author: intersectRaven

Dockerfile

@@ -48,7 +48,7 @@ RUN set -ex; \
 # see https://docs.nextcloud.com/server/stable/admin_manual/configuration_server/server_tuning.html#enable-php-opcache
 RUN { \
         echo 'opcache.enable=1'; \
-        echo 'opcache.interned_strings_buffer=8'; \
+        echo 'opcache.interned_strings_buffer=16'; \
         echo 'opcache.max_accelerated_files=10000'; \
         echo 'opcache.memory_consumption=128'; \
         echo 'opcache.save_comments=1'; \