Allow the use of overridden values

I want to override the token value in my settings.php:

...
$secrets = json_decode(file_get_contents($secretsFile), TRUE);
if (isset($secrets['instagram_nodes__token'])) {
  $config['instagram_nodes.config']['token'] = $secrets['instagram_nodes__token'];
}
...

But it is not working with the actual code. I will create a patch to address this.