John Skarbek authored Mar 17, 2021 and DJ Mountney committed Mar 17, 2021

* This is primarily utilized for Geo
* At this point, we create the ability to configure our Rails
  application with the secret item required
* This DOES NOT attempt to add the secret item to the Container Registry
  * Save for a future MR?
* Adds the necessary testing with a helper to dig deep into the nesting
  produced by our YAML files
* Proposal adds the following:

```yaml
global:
  registry:
    notificationSecret:
      enabled: true
```

The above will configure a secret with a sane default if required and
set this on the gitlab.yml file

As this gitlab.yml file is shared amoung all deployments, this secret
needs to be mounted into the init containers for Sidekiq and Webservices

⚠ This does not configure the Container Registry side of items