`initial_shared_runners_registration_token` configuration is ignored

Summary

gitlab/gitlab-ee:13.12.1-ee.0 is ignoring the configuration for gitlab_rails['initial_shared_runners_registration_token']

Steps to reproduce

This works as expected:

docker run --detach  --rm \
  --env GITLAB_OMNIBUS_CONFIG="gitlab_rails['initial_shared_runners_registration_token'] = 'runner-reg-token'; " \
  --publish 8080:80 \
  --name gitlab_13_11 \
  gitlab/gitlab-ee:13.11.3-ee.0

This does not work as expected

docker run --detach  --rm \
  --env GITLAB_OMNIBUS_CONFIG="gitlab_rails['initial_shared_runners_registration_token'] = 'runner-reg-token'; " \
  --publish 8090:80 \
  --name gitlab_13_12 \
  gitlab/gitlab-ee:13.12.1-ee.0

Example Project

What is the current bug behavior?

The token is generated randomly, ignoring the configuration.

What is the expected correct behavior?

The token is generated as per the configuration

Relevant logs and/or screenshots

See Steps to reproduce

Possible fixes