Auto-generated secrets should be release specific
Followup to https://gitlab.com/charts/helm.gitlab.io/issues/260
They should have the release prefixed to them, so we can deploy multiple gitlab instances in the same namespace, and not require they use the same secrets.
We also want to provide the ability to provide custom secretNames, so you can provide your own secrets if needed. (Migrating an existing instance for example)
cc\ @Ahmadposten