feat: Add arn of created group(s) to outputs (#128)

modules/iam-group-with-assumable-roles-policy/README.md

@@ -28,6 +28,7 @@ Creates IAM group with users who are allowed to assume IAM roles. This is typica
 
 | Name | Description |
 |------|-------------|
+| group\_arn | IAM group arn |
 | group\_name | IAM group name |
 | this\_assumable\_roles | List of ARNs of IAM roles which members of IAM group can assume |
 | this\_group\_users | List of IAM users in IAM group |

modules/iam-group-with-assumable-roles-policy/outputs.tf

@@ -18,3 +18,8 @@ output "group_name" {
   value       = aws_iam_group.this.name
 }
 
+output "group_arn" {
+  description = "IAM group arn"
+  value       = aws_iam_group.this.arn
+}
+