feat: Default to using cos_containerd image for GKE Sandbox clusters (terraform-google-modules#854)

Author: diegolnasc

autogen/main/cluster.tf.tmpl

@@ -483,7 +483,11 @@ resource "google_container_node_pool" "pools" {
  {% endif %}
 
  node_config {
+ {% if beta_cluster %}
+ image_type = lookup(each.value, "image_type", var.sandbox_enabled ? "COS_CONTAINERD" : "COS")
+ {% else %}
  image_type = lookup(each.value, "image_type", "COS")
+ {% endif %}
  machine_type = lookup(each.value, "machine_type", "e2-medium")
  labels = merge(
  lookup(lookup(local.node_pools_labels, "default_values", {}), "cluster_name", true) ? { "cluster_name" = var.name } : {},

modules/beta-private-cluster-update-variant/cluster.tf

@@ -438,7 +438,7 @@ resource "google_container_node_pool" "pools" {
  }
 
  node_config {
- image_type = lookup(each.value, "image_type", "COS")
+ image_type = lookup(each.value, "image_type", var.sandbox_enabled ? "COS_CONTAINERD" : "COS")
  machine_type = lookup(each.value, "machine_type", "e2-medium")
  labels = merge(
  lookup(lookup(local.node_pools_labels, "default_values", {}), "cluster_name", true) ? { "cluster_name" = var.name } : {},

modules/beta-private-cluster/cluster.tf

@@ -354,7 +354,7 @@ resource "google_container_node_pool" "pools" {
  }
 
  node_config {
- image_type = lookup(each.value, "image_type", "COS")
+ image_type = lookup(each.value, "image_type", var.sandbox_enabled ? "COS_CONTAINERD" : "COS")
  machine_type = lookup(each.value, "machine_type", "e2-medium")
  labels = merge(
  lookup(lookup(local.node_pools_labels, "default_values", {}), "cluster_name", true) ? { "cluster_name" = var.name } : {},

modules/beta-public-cluster-update-variant/cluster.tf

@@ -419,7 +419,7 @@ resource "google_container_node_pool" "pools" {
  }
 
  node_config {
- image_type = lookup(each.value, "image_type", "COS")
+ image_type = lookup(each.value, "image_type", var.sandbox_enabled ? "COS_CONTAINERD" : "COS")
  machine_type = lookup(each.value, "machine_type", "e2-medium")
  labels = merge(
  lookup(lookup(local.node_pools_labels, "default_values", {}), "cluster_name", true) ? { "cluster_name" = var.name } : {},

modules/beta-public-cluster/cluster.tf

@@ -335,7 +335,7 @@ resource "google_container_node_pool" "pools" {
  }
 
  node_config {
- image_type = lookup(each.value, "image_type", "COS")
+ image_type = lookup(each.value, "image_type", var.sandbox_enabled ? "COS_CONTAINERD" : "COS")
  machine_type = lookup(each.value, "machine_type", "e2-medium")
  labels = merge(
  lookup(lookup(local.node_pools_labels, "default_values", {}), "cluster_name", true) ? { "cluster_name" = var.name } : {},