Implement STS Web Identity Role credentials provider #286
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What this PR does
AWS credentials array will have STS Web Identity token provider as the first option if
AWS_ROLE_ARN
andAWS_WEB_IDENTITY_TOKEN_FILE
are available and non-empty in environment.Motivation
One of the common ways to provide S3 (or any AWS related service) access to a pod in EKS is to annotate k8s service account with specified IAM Role. Then AWS Web Identity token gets mounted to the pod and
AWS_ROLE_ARN
andAWS_WEB_IDENTITY_TOKEN_FILE
environment variables are provided automatically to the pod.This PR enables use of these credentials.