ActionCable fails to connect to Redis when password is provided via config_command

When Redis server password is provided to rails via gitlab_rails['redis_extra_config_command'] following https://docs.gitlab.com/omnibus/settings/configuration.html#provide-sensitive-configuration-to-components-without-plain-text-storage, ActionCable fails to contact Redis because the config file cable.yml does not make use of the external command execution logic.

Testing

1. Deploy a GitLab instance making use of https://docs.gitlab.com/omnibus/settings/configuration.html#provide-sensitive-configuration-to-components-without-plain-text-storage (you can use https://gitlab.com/balasankarc/omnibus-gitlab-docker-compose/-/tree/main/redis/extra-config)

2. In Rails console, execute the following command and see it fails

   ActionCable.server.pubsub.redis_connection_for_subscriptions.ping

3. When everything works, the command should return "PONG", indicating ActionCable was able to reach the Redis server