Setting up cross-account AWS IAM roles via terraform

For use of this terraform repo you need two profiles set up in your ~/.aws/credentials file, "utils" and "prod" pointing to two different AWS account.

1. Run terraform init
2. Run terraform plan -out tfplan
3. Run terraform apply tfplan

When you've done that, you can assume the role either via the GUI or CLI. aws sts assume-role --role-arn "<role_arn>" --role-session-name "<name>"