chore: use env var overrides

Author: tobybellwood

assets/settings.lagoon.php

@@ -40,8 +40,8 @@
     'password' => getenv('MARIADB_PASSWORD') ?: 'drupal',
     'host' => getenv('MARIADB_HOST') ?: 'mariadb',
     'port' => getenv('MARIADB_PORT') ?: 3306,
-    'charset' => 'utf8mb4',
-    'collation' => 'utf8mb4_general_ci',
+    'charset' => getenv('MARIADB_CHARSET') ?: 'utf8mb4',
+    'collation' => getenv('MARIADB_COLLATION') ?: 'utf8mb4_general_ci',
     'prefix' => '',
   ];
 }