I think this is safe to commit across environments

Note that i deleted a 'sync' directory config it added so that our own
would be used.

ddev_drush_settings.php

@@ -0,0 +1,24 @@
+<?php
+
+$version = "";
+if (defined("\Drupal::VERSION")) {
+    $version = \Drupal::VERSION;
+} else if (defined("VERSION")) {
+    $version = VERSION;
+}
+
+// Use the array format for D7+
+if (version_compare($version, "7.0") > 0) {
+  $databases['default']['default'] = array(
+    'database' => "db",
+    'username' => "db",
+    'password' => "db",
+    'host' => "127.0.0.1",
+    'driver' => "mysql",
+    'port' => 32768,
+    'prefix' => "",
+  );
+} else {
+  // or the old db_url format for d6
+  $db_url = 'mysqli://db:db@127.0.0.1:32768/db';
+}