fix(config): Update default PostgreSQL host to coolify-db instead of postgres

config/database.php

@@ -38,7 +38,7 @@ return [
         'pgsql' => [
             'driver' => 'pgsql',
             'url' => env('DATABASE_URL'),
-            'host' => env('DB_HOST', 'postgres'),
+            'host' => env('DB_HOST', 'coolify-db'),
             'port' => env('DB_PORT', '5432'),
             'database' => env('DB_DATABASE', 'coolify'),
             'username' => env('DB_USERNAME', 'coolify'),