Added support for private image repository credentials for Batch #1832
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As mentioned in #1820, there is currently no way to authenticate with a private container image repo for Batch. In AWS, the ARN of a secret containing those credentials can be included in the job definition, which is what I've exposed from Metaflow. I added this as a Metaflow configuration called
BATCH_CONTAINER_IMAGE_CREDS_SECRET, to the@batchdecorator asrepo_creds_secret, and to the batch cli as--repo-creds-secret.