Internal Gitlab registry failing auth with 401

[Elias Hackradt]

Tracking Issue for PR.
In the defaults gitlab_external_url is mentioned with a trailing / this will result in a bad registry configuration:

path: /var/opt/gitlab/registry/config.yml

auth:
  token:
    realm: https://sub.domain.tld//jwt/auth

because in the gitlab.rb file the external_url "https://sub.domain.tld/" will be combined with the /jwt/auth leading to // in the domain. (Sorry could not find the internal gitlab code where this happens)

[github-actions]

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