Custom branding hooked to an env. variable instead to values in config.yaml

Because of the following directive in Dockerfile.osbs, the branding directives are completely ignored on most deployments of the official Red Hat Quay images:

https://github.com/quay/quay/blob/085e33bed74957fc083a03868bb7bfb1b892dc48/Dockerfile.osbs#L52

Branding is specifically defined here:

https://github.com/quay/quay/blob/2ffc12b3eb5e36c070df80fcd5ffffa9593fd22a/config.py#L183
https://github.com/quay/quay/blob/2ffc12b3eb5e36c070df80fcd5ffffa9593fd22a/config.py#L445

Registry titles are also not followed. Even if I set REGISTRY_TITLE and REGISTRY_TITLE_SHORT in the config.yaml file to something random, I don't see that random string in Quay when I deploy it.

Finally, the official documentation lists the REGISTRY_TITLE default as Quay Enterprise which is not correct:

According to our own config schema, the default value is Red Hat Quay:

https://github.com/quay/quay/blob/f35f3f137cd5d1e4594438e0db5c498651f1a396/util/config/schema.py#L159