Allow env configuration file to be used as secrets

[nawanglama-krispcall]

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

Adding .env or config.yaml

Describe the solution you'd like

Only Key Value parameter is working as secrets not env file or configuration files.
Giving user option to send secrets as env or file.

Describe alternatives you've considered

A clear and concise description of any alternative solutions or features you've considered.

Additional context

Add any other context or screenshots about the feature request here.

[fairclothjm]

Duplicate of #437. Closing in favor of that ticket