Jeremy Fleischman 9c02a1e422 services/cloudflare-dyndns: require that apiTokenFile be an api token ...

Previously, this option was supposed to be a file of the form
`CLOUDFLARE_API_TOKEN=...`, which has a few problems:

- That's not an api token. It's an env file fit for passing to systemd's
  `EnvironmentFile` option. The user could typo the variable name, or
  intentionally/unintentionally include unrelated environment variables.
- It's not how secret files usually work in NixOS. Secret files are
  usually just the secret, and don't leak details about how the secret
  is passed to the service.
- This increases friction for people switching between cloudflare dyndns
  services, such as `services.cloudflare-dyndns` and
  `services.cfdyndns`, which both have a `apiToken` option, but (before
  this change) with different semantics.

2025-03-19 18:19:29 -05:00

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