feat: Add role_name_prefix option for oidc roles (#101)

modules/iam-assumable-role-with-oidc/README.md

@@ -33,7 +33,8 @@ This module supports IAM Roles for kubernetes service accounts as described in t
 | provider\_url | URL of the OIDC Provider. Use provider\_urls to specify several URLs. | `string` | `""` | no |
 | provider\_urls | List of URLs of the OIDC Providers | `list(string)` | `[]` | no |
 | role\_description | IAM Role description | `string` | `""` | no |
-| role\_name | IAM role name | `string` | `""` | no |
+| role\_name | IAM role name | `string` | `null` | no |
+| role\_name\_prefix | IAM role name prefix | `string` | `null` | no |
 | role\_path | Path of IAM role | `string` | `"/"` | no |
 | role\_permissions\_boundary\_arn | Permissions boundary ARN to use for IAM role | `string` | `""` | no |
 | role\_policy\_arns | List of ARNs of IAM policies to attach to IAM role | `list(string)` | `[]` | no |

modules/iam-assumable-role-with-oidc/main.tf

@@ -54,6 +54,7 @@ resource "aws_iam_role" "this" {
   count = var.create_role ? 1 : 0
 
   name                 = var.role_name
+  name_prefix          = var.role_name_prefix
   description          = var.role_description
   path                 = var.role_path
   max_session_duration = var.max_session_duration

modules/iam-assumable-role-with-oidc/variables.tf

@@ -31,7 +31,13 @@ variable "tags" {
 variable "role_name" {
   description = "IAM role name"
   type        = string
-  default     = ""
+  default     = null
+}
+
+variable "role_name_prefix" {
+  description = "IAM role name prefix"
+  type        = string
+  default     = null
 }
 
 variable "role_description" {