Include links and information for gomplate

[codecleric]

Preflight Checklist

• [X] I agree to follow the Code of Conduct that this project adheres to.
• [X] I have searched the issue tracker for an issue that matches the one I want to file, without success.

Problem Description

DexIDP in the Docker environment (specifically docker-entrypoint ) uses gomplate under the hood to process configuration files and interpolation with env vars. This does not seem to be documented anywhere, and only by search though source is one able to determine valid and invalid ways to configure the docker environment for DexIDP. The gomplate docs are an invaluable resource for this information

Proposed Solution

Expand information related to creating and using templated configurations in the Docker environment and pointing to the gomplate as an additional documentation source.

Alternatives Considered

None

Additional Information

No response

[peschmae]

Also document the intended interaction in kubernetes, as the provided example k8s deployment isn't using the docker-entrypoint but rather the dex binary directly.