Add EKS-A build account to Prow cred helpers config

[abhay-krishna]

We need this to be able to use the build account ECR cache in EKS-A presubmits.

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[eks-distro-bot]

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[jaxesn]

Thanks

[abhay-krishna]

Force merging this since Tide won't automerge due to the GitHub action returning a Skipped conclusion.

[eks-distro-bot]

@abhay-krishna: Updated the following 2 configmaps:

• build-setup configmap in namespace default at cluster prow-presubmits-cluster using the following files:
  • key docker-ecr-config.json using file config/docker-ecr-config.json
• build-setup configmap in namespace default at cluster prow-postsubmits-cluster using the following files:
  • key docker-ecr-config.json using file config/docker-ecr-config.json

In response to this:

We need this to be able to use the build account ECR cache in EKS-A presubmits.

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