169163334 - Adds autoscaling to k8s

This adds node autoscaling the k8s. Pod autoscaling needs to be
configured in the kubectl config.

terraform/modules/k8s/main.tf

@@ -21,6 +21,9 @@ resource "azurerm_kubernetes_cluster" "k8s" {
     vnet_subnet_id        = var.vnet_subnet_id
     node_count            = 1
     enable_node_public_ip = true # Nodes need a public IP for external resources. FIXME: Switch to NAT Gateway if its available in our subscription
+    enable_auto_scaling   = var.enable_auto_scaling
+    max_count             = var.max_count # FIXME: if auto_scaling disabled, set to 0
+    min_count             = var.min_count # FIXME: if auto_scaling disabled, set to 0
   }
 
   lifecycle {