feat(config): add REDIS_DATABASE support

Add the possibility to set the redis database to use.
The default value is still 0

config/database.php

@@ -155,7 +155,7 @@ return [
             'host'     => env('REDIS_HOST', 'localhost'),
             'password' => env('REDIS_PASSWORD', null),
             'port'     => env('REDIS_PORT', 6379),
-            'database' => 0,
+            'database' => env('REDIS_DATABASE', 0),
         ],
 
     ],