unconditionally fetch credentials during ecr subcommand setup
unconditionally fetch credentials during ecr subcommand setup

Fixes issue for external IdP clients where we don't have
the necessary SAML of OIDC data to interact with the AWS API

mmmorris1975/aws-runas,mmmorris1975/aws-runas,mmmorris1975/aws-runas,mmmorris1975/aws-runas,mmmorris1975/aws-runas