fix: Update flow log ARNs to use partition from aws_partition data so…

…urce (#1112)

Update flow log ARNs to use partition from aws_partition data source, ensuring compatibility with AWS GovCloud and other partitions

tfdocs

README.md

@@ -352,6 +352,7 @@ No modules.
 | [aws_caller_identity.current](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/caller_identity) | data source |
 | [aws_iam_policy_document.flow_log_cloudwatch_assume_role](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/iam_policy_document) | data source |
 | [aws_iam_policy_document.vpc_flow_log_cloudwatch](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/iam_policy_document) | data source |
+| [aws_partition.current](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/partition) | data source |
 | [aws_region.current](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/region) | data source |
 
 ## Inputs

vpc-flow-logs.tf

@@ -8,6 +8,11 @@ data "aws_caller_identity" "current" {
   count = var.create_vpc && var.enable_flow_log ? 1 : 0
 }
 
+data "aws_partition" "current" {
+  # Call this API only if create_vpc and enable_flow_log are true
+  count = var.create_vpc && var.enable_flow_log ? 1 : 0
+}
+
 locals {
   # Only create flow log if user selected to create a VPC as well
   enable_flow_log = var.create_vpc && var.enable_flow_log
@@ -20,7 +25,7 @@ locals {
   flow_log_cloudwatch_log_group_name_suffix = var.flow_log_cloudwatch_log_group_name_suffix == "" ? local.vpc_id : var.flow_log_cloudwatch_log_group_name_suffix
   flow_log_group_arns = [
     for log_group in aws_cloudwatch_log_group.flow_log :
-    "arn:aws:logs:${data.aws_region.current[0].name}:${data.aws_caller_identity.current[0].account_id}:log-group:${log_group.name}:*"
+    "arn:${data.aws_partition.current[0].partition}:logs:${data.aws_region.current[0].name}:${data.aws_caller_identity.current[0].account_id}:log-group:${log_group.name}:*"
   ]
 }