Read environment values from a configuration or AWS secrets

One of the use cases for this project is to test if say an AWS Elastic Container service was provisioned properly and can serve out a python application.

Part of the work we are doing also involved reading from the secrets manager for the application tog get values from the environment like an RDS endpoint or S3 bucket keys.

[pyndatic can read values from the secrets manager](https://aminalaee.dev/posts/2023/pydantic-settings-secret-manager/) thanks to `boto3` and IAM policies.

To make this image generic it would be nice to be able to provide it a list of environment variables that the template can pull values out of AWS secrets manager or the environment variables and render the page.

The aim to make this template as reusable as possible.