Manage secrets

[king-alexander]

💡 Summary

Move all sensitive data -- in particular, CELERY_BROKER_URL -- into the secrets raft.

Motivation and context

We shouldn’t store any sensitive data in source control. Additionally, we want a layer of abstraction between these containers and the set of credentials. This makes for better secret management.

[king-alexander]

I haven't found a good reference for how to make the URL a secret. The simple, but non-elegant, solution would be to define the URL in a secret text file, but that would lead to unnecessary duplication. I need a way to configure the workers and flower from the same file.