use database_path helper for sqlite database filename specified in .env

config/database.php

@@ -35,7 +35,7 @@ return [
 
         'sqlite' => [
             'driver' => 'sqlite',
-            'database' => env('DB_DATABASE', database_path('database.sqlite')),
+            'database' => database_path(env('DB_DATABASE', 'database.sqlite')),
             'prefix' => '',
         ],