[AssetMapper] Avoid loading potentially ALL assets in dev server

Author: weaverryan

Resources/config/asset_mapper.php

@@ -83,6 +83,7 @@
                 service('asset_mapper'),
                 abstract_arg('asset public prefix'),
                 abstract_arg('extensions map'),
+                service('cache.asset_mapper'),
             ])
             ->tag('kernel.event_subscriber', ['event' => RequestEvent::class])
 

Resources/config/cache.php

@@ -66,6 +66,11 @@
             ->private()
             ->tag('cache.pool')
 
+        ->set('cache.asset_mapper')
+            ->parent('cache.system')
+            ->private()
+            ->tag('cache.pool')
+
         ->set('cache.messenger.restart_workers_signal')
             ->parent('cache.app')
             ->private()