Provide apikey through environment variable, rather than config.json?

[nocturne1]

Is your feature request related to a problem? Please describe.
I am hoping to deploy my configuration through gitops methods in Portainer. Since the deployment files would be in an external repo, including the config.json to allow settings changes without access to the host. But currently, this means apikey is also defined there in plain text. I have tried removing from the config.json and setting via an environment variable, but it's not seen by the script.

Describe the solution you'd like
Allow apikey to be pulled in via environment variables. Supporting all config items via environment variables would be even better.

Describe alternatives you've considered
Editing manually on host, but this does not allow "source of truth" to be in git repo.