added the option to use a AWS role ARN to authenticate to ECR if on EKS

[htrappmann]

Added the option to use an AWS IAM role ARN to authenticate to ECR if on EKS as described here:
https://docs.aws.amazon.com/eks/latest/userguide/create-service-account-iam-policy-and-role.html
In this case you don't need to use fixed access-key/secret-key/session-token to authenticate to ECR.

Signed-off-by: Henryk Trappmann [email protected]

[jetstack-bot]

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[JoshVanL]

/lgtm /approve

[jetstack-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: htrappmann, JoshVanL

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