Add opcache to symfony apps

components/hydra-sql/files/03_base.ini

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+[opcache]
+; Determines if Zend OPCache is enabled
+opcache.enable=1
+
+; Determines if Zend OPCache is enabled for the CLI version of PHP
+opcache.enable_cli=1
+
+; The OPcache shared memory storage size.
+opcache.memory_consumption=512
+
+; The maximum number of keys (scripts) in the OPcache hash table.
+; Only numbers between 200 and 1000000 are allowed.
+opcache.max_accelerated_files=20000
+
+; When disabled, you must reset the OPcache manually or restart the
+; webserver for changes to the filesystem to take effect.
+opcache.validate_timestamps=${OPCACHE_VALIDATE_TIMESTAMP}
+
+; How often (in seconds) to check file timestamps for changes to the shared
+; memory storage allocation. ("1" means validate once per second, but only
+; once per request. "0" means always validate)
+opcache.revalidate_freq=${OPCACHE_REVALIDATE_FREQ}