set lua cache to on

lapis/config.lua

@@ -9,6 +9,6 @@ end)
 return config("production", function()
   port(80)
   num_workers(4)
-  lua_code_cache("off")
+  lua_code_cache("on")
   return postgresql_url("postgres://benchmarkdbuser:[email protected]/hello_world")
 end)