chore: set opcache.file_cache_only=1 in shared php.ini

Author: carlalexander

runtime/shared/php.ini

@@ -16,6 +16,7 @@ opcache.enable_cli=1
 
 ; Store the opcodes into a file cache instead of memory as a fallback.
 opcache.file_cache="/tmp"
+opcache.file_cache_only=1
 
 ; Set sane values, modern PHP applications have higher needs than opcache's defaults.
 ; See https://tideways.com/profiler/blog/fine-tune-your-opcache-configuration-to-avoid-caching-suprises