The Vault AWS Credential Helper is a component that can be injected into a task environment and be used as a credential helper process for the AWS SDK. More details about the AWS configuration can be found on this page.
You must export VACH_VAULT_BLOB to the environment as a path that
points to the JSON blob from the Vault AWS Secrets backend.
In your Vault Template file, you should specify the secret like below to ensure the JSON winds up in the right shape:
{{secret "aws/creds/my-app" | toJSON}}