Fix problems with DI and Eloquent

- Thunk "vlucas/phpdotenv": "^v4.2.0"
- db.php uses `getenv()` instead of the one time it used `env()`

config/db.php

@@ -9,7 +9,7 @@
         $eloquent = new Capsule;
 
         $eloquent->addConnection([
-            'driver'    => env('DB_DRIVER') ?? 'mysql',
+            'driver'    => getenv('DB_DRIVER') ?? 'mysql',
             'host'      => getenv('DB_HOST'),
             'port'      => getenv('DB_PORT') ?? '',
             'database'  => getenv('DB_NAME'),