Comment 1 for bug 1897155

o/ Sergii - thanks for filing this, there is definitely a bug here.

The error can be seen in this file (from your logs in the description): https://2302f195cca0bd2fbfcf-1aafb108750144ecd9565eaf1429d9e4.ssl.cf1.rackcdn.com/753807/1/check/tripleo-ci-centos-8-standalone-upgrade-ussuri/666dcd1/logs/reproducer-quickstart/featureset-override.yaml

The standalone_custom_env_files: should not be in there it should be only the standalone_environment_files

The problem comes from there https://opendev.org/openstack/tripleo-ci/src/commit/820e3fe31e6988ae6070c319dbf8372ab1489a3b/roles/run-test/tasks/main.yaml#L43-L62 ... somewhere - perhaps you can dig a bit more with this pointer?

Hope it helps for now.