Configure elastic bamboo with IAM role.

Currently, Bamboo requires the user to specify a specific User when configuring Elastic Bamboo.

• Configuring Elastic Bamboo

This feature request is to allow a user to specify an IAM Role instead of a specific user when configuring Elastic Bamboo. There is an existing feature request to allow Bamboo to use an IAM Role in all API requests to AWS [BAM-17341: Using 'Assume Role' for AWS API calls instead of traditional authentication key ID and secret key] but this does not explicitly address Configuring Elastic Bamboo and hence is hard for the users to find and vote on.