Unable to use !secret for configuration file

[maxi1134]

Hi there,
First of all, Thanks a lot fo this great tool!

When trying to use a secret in the config.yaml file under config/espresense/ the use of !secret for the mqtt_password fails with the following error:

Process Architecture: X64
[17:36:03 INF] Loading /config/espresense/config.yaml
[17:36:03 ERR] Error reading config, ignoring... (Line: 7, Col: 13, Idx: 155) - (Line: 7, Col: 34, Idx: 176): Encountered an unresolved tag '!secret'
[17:36:03 INF] Loading /config/espresense/config.yaml
[17:36:03 ERR] Error reading config, ignoring... (Line: 7, Col: 13, Idx: 155) - (Line: 7, Col: 34, Idx: 176): Encountered an unresolved tag '!secret'

It would be great if we can use the secret file as prescribed by the HA team for passwords.

Cheers!