Use transient, in-memory database

Author: paulbalandan

tests/system/Database/Live/SQLite/AlterTableTest.php

@@ -52,7 +52,7 @@ protected function setUp(): void
 
         $config = [
             'DBDriver' => 'SQLite3',
-            'database' => 'database.db',
+            'database' => ':memory:',
             'DBDebug'  => true,
         ];