this might work

cluster-provisioning/terraform/appinsights.tf

@@ -1,12 +1,8 @@
-resource "azurerm_resource_group" "demo" {
-  name     = "${var.resource_group_name}"
-  location = "${var.location}"
-}
 
 resource "azurerm_application_insights" "demo" {
   name                = "${var.prefix}-ai"
   location            = "${var.location}"
-  resource_group_name = "${azurerm_resource_group.demo.name}"
+  resource_group_name = "${var.resource_group}"
   application_type    = "web"
 }
 

cluster-provisioning/terraform/variables.tf

@@ -121,6 +121,7 @@ variable "github_organization" {
 }
 
 variable "github_repository_name" {
+  default = "sg-aks-workshop"
   description = "Name of the Github repository for Flux"
 }