Using secrets via Flexvolume with Velero for backup / restore

[jmspring]

As a developer, I want to research, document, and implement the best possible method to leverage secrets within a flex volume instead of storing them in the YAML file.

Options:

• [x] .env
• [ ] side car/init container
• [ ] contribute alternative secrets to helm chart (ways to gather them) (flexvolume -> k8s secret)
• [ ] discussion with Rita - alternative methods to read flex volume secrets

Fabrikate definition needs documentation on how to retrieve value of secrets.