Drupal.org gitlab ci test scripts install Drupal in a subdirectory.
This exposes various tests that break when we have a /subdir path before the Drupal root.
To mimic these tests locally, we really need Drupal installed in a subdirectory.
Such that, from the host machine we can access the homepage at https://localgov.ddev.site/subdir
From within the web container, we can access the homepage at http://web/subdir
Then make sure all the phpunit tests run with this /subdir path.