fix: Allow modules/iam-assumable-role-with-oidc to work in govcloud (#83)

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

@@ -4,6 +4,8 @@ locals {
 
 data "aws_caller_identity" "current" {}
 
+data "aws_partition" "current" {}
+
 data "aws_iam_policy_document" "assume_role_with_oidc" {
   count = var.create_role ? 1 : 0
 
@@ -16,7 +18,7 @@ data "aws_iam_policy_document" "assume_role_with_oidc" {
       type = "Federated"
 
       identifiers = [
-        "arn:aws:iam::${local.aws_account_id}:oidc-provider/${var.provider_url}"
+        "arn:${data.aws_partition.current.partition}:iam::${local.aws_account_id}:oidc-provider/${var.provider_url}"
       ]
     }