How to load AWS credential from container

[JardarTemalogic]

I am using nestjs inside and AWS container, run by Fargate. I want to have the AWS credentials set from how the IAM Role is assigne to the task, as according to this article:
https://docs.aws.amazon.com/AmazonECS/latest/developerguide/task-iam-roles.html

How would I do this?