Add example using aws-actions/configure-aws-credentials

[Doug Tangren]

https://github.com/aws-actions/configure-aws-credentials is an action aws provides that exports a static or sts assumed set of credentials as workflow job env vars

For users of that action provides an example provide notes and example of how to pair with this action.

Notably if you use the configure action and then rotary the job scoped env credentials will have been invalidated via rotation. Let's make that clear in an experimental example