fix(core): add missing config cache initializer (#1340)

Co-authored-by: Brent Roose <[email protected]>

Author: lukaskleinschmidt

packages/core/src/FrameworkKernel.php

@@ -157,6 +157,7 @@ public function loadDiscovery(): self
 
     public function loadConfig(): self
     {
+        $this->container->addInitializer(ConfigCacheInitializer::class);
         $this->container->invoke(LoadConfig::class);
 
         return $this;