Nextcloud login error: Access through untrusted domain

The pipeline for !87 (merged) fails for the behave test. This is the screenshot: https://code.greenhost.net/openappstack/bootstrap/-/jobs/23699/artifacts/file/test/behave/screenshots/2019-05-21T13-06-36-failed-I-wait-on-element--input-user--for-25000ms-to-be-visible.png

See also https://files.ci-7288.ci.openappstack.net/ while it's up.

https://docs.nextcloud.com/server/15/go.php?to=admin-trusted-domains.