Reference castai_node_configuration from within module. (#46)

This update provides the option to pass in the configuration GUID or the resource key for all configuration_id references. This is a backwards-compatible update that maintains the current functionality of the external self-reference of the module's castai_node_configurations output.

main.tf

@@ -1,3 +1,7 @@
+locals {
+  configuration_id_regex_pattern = "[a-zA-Z0-9]{8}-[a-zA-Z0-9]{4}-[a-zA-Z0-9]{4}-[a-zA-Z0-9]{4}-[a-zA-Z0-9]{12}"
+}
+
 resource "castai_aks_cluster" "castai_cluster" {
   name = var.aks_cluster_name
 
@@ -9,7 +13,6 @@ resource "castai_aks_cluster" "castai_cluster" {
 
   node_resource_group        = var.node_resource_group
   delete_nodes_on_disconnect = var.delete_nodes_on_disconnect
-
 }
 
 resource "castai_node_configuration" "this" {
@@ -32,7 +35,9 @@ resource "castai_node_configuration" "this" {
 
 resource "castai_node_configuration_default" "this" {
   cluster_id       = castai_aks_cluster.castai_cluster.id
-  configuration_id = var.default_node_configuration
+  configuration_id = length(regexall(local.configuration_id_regex_pattern, var.default_node_configuration)) > 0 ? var.default_node_configuration : castai_node_configuration.this[var.default_node_configuration].id
+
+  depends_on = [ castai_node_configuration.this ]
 }
 
 resource "castai_node_template" "this" {
@@ -43,7 +48,7 @@ resource "castai_node_template" "this" {
   name             = try(each.value.name, each.key)
   is_default       = try(each.value.is_default, false)
   is_enabled       = try(each.value.is_enabled, null)
-  configuration_id = try(each.value.configuration_id, null)
+  configuration_id = can(each.value.configuration_id) ? length(regexall(local.configuration_id_regex_pattern, each.value.configuration_id)) > 0 ? each.value.configuration_id : castai_node_configuration.this[each.value.configuration_id].id : null
   should_taint     = try(each.value.should_taint, true)
 
   custom_labels = try(each.value.custom_labels, {})