Support fernet key rotation

[jedcunningham]

Description

The current helm chart only allows for easy setting of the fernet key during initial install, and provides no easy way or help with rotating it afterwards.

Use case/motivation

Chart users will eventually (hopefully!) want to rotate their fernet key, and there should be an easy way to do it with the chart.

This may include advising users to explicitly set their fernet key, even if they keep using the generated one, so they are better posed to recover if they need to reinstall their instance.

Related issues

Webserver secret key, also randomly generated, was handled in but the fernet key needs a different approach: #18098

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct