FR: Template secrets

[dantefromhell]

I have a setup in which I repeatedly have to store API secrets that consist of multiple variables (https://go-acme.github.io/lego/dns/cloudflare/#api-tokens) in a single agenix secret.

Creating a new secret feels a bit cumbersome so I wondered if there's a possibility to add support for templates.

My naive idea is something like:

age.secrets."newSecret" = {
  rekeyFile = ./aSecretFile.age;
  templateFile = ./aTemplateForSecrets.txt;
};

Another possibility could be to add template which accepts a string so that one can use
nix code to manage the template.

The workflow would be:
if agenix edit aSecretFile.age is called but the age file does not exist, pre-fill the editor with the
text from template or the file-content of templateFile.