added cachetool to invalidate shared php cache (APCu, OPcache) without reloading PHP-FPM

env-example

@@ -190,6 +190,7 @@ PHP_FPM_INSTALL_IONCUBE=false
 PHP_FPM_INSTALL_RDKAFKA=false
 PHP_FPM_FAKETIME=-0
 PHP_FPM_INSTALL_APCU=false
+PHP_FPM_INSTALL_CACHETOOL=false
 PHP_FPM_INSTALL_YAML=false
 PHP_FPM_INSTALL_ADDITIONAL_LOCALES=false
 PHP_FPM_INSTALL_MYSQL_CLIENT=false