secret interpolation

[tommij]

it would be really nice to have the ability to interpolate secrets via pointing to another secret.
e.g. in the case of AD credentials being used in multiple places/websites etc, it's a PITA to have to update your password in multiple places on every rotation.

similar'ish to yaml alias'ing, or homeassistant !secret (https://www.home-assistant.io/docs/configuration/secrets/)

pseudo:
/misc/secret1
secret_key: verySecretPassword

/misc/secret2

Secret: Account/www.foo.org
!Secret: /misc/secret1
---
user: Horses

/misc/secret3
Secret: Account/www.bar.org
!Secret: /misc/secret1
---
User: Peaches