Assume role for externally defined role is failing in validator. #11
Description
The use of an externally defined role for data access from within the validator fails.
I've investigated several possible causes for this issue with no success https://stackoverflow.com/questions/66458621/aws-cdk-cannot-assume-role-in-lambda-for-fine-grained-authorization.
@alukach Can you verify that this role injection functionality is working from veda-stac-ingestor.
I temporarily removed this functionality in #8 in order to have a functional construct for testing.