Feature request: Support Permission Boundaries

[andyrepton]

We have customers who have restrictions in place that the operator and account roles cannot be created without having a permissions boundary. This is supported in the aws_iam_role but not available via the module yet.

[Scorpiion]

I work together with @Seth-Karlo in the Red Hat EMEA Black Belt team. I just wanted to add that this is supported in the rosa cli:

$ rosa create operator-roles --help

....

Examples:
  # Create operator roles with a specific permissions boundary
  rosa create operator-roles -c mycluster --permissions-boundary arn:aws:iam::123456789012:policy/perm-boundary

Flags:
...
      --permissions-boundary string   The ARN of the policy that is used to set the permissions boundary for the operator roles.
...

We would like to use this same feature in terraform.

[bardielle]

I opened a PR for that :
#13

[andyrepton]

Thanks very much!