Is your feature request related to a problem? Please describe.

Hey! Thanks for this project!

Is there a way to pass secrets into config.yaml file via some sort of keyword?

Describe the solution you'd like

For example, Home Assistant and zigbee2mqtt projects provide an ability to pass secrets or env vars via keywords in a YAML files. Like this:

token: !env TOKEN_ENV_VARIABLE
# or
token: !secret token # token field from secrets.yaml file

Describe alternatives you've considered

¯_(ツ)_/¯

Additional context

I am open sourcing my smart home config and would like to use Homer for a dashboard of my smart home server. I would love to publish my config, by I also need to pass some secrets to the config (like token for Portainer or Pi Hole, etc)