feat: Add support for AL2023 nodeadm user data (#2942)

examples/eks_managed_node_group/main.tf

@@ -86,6 +86,29 @@ module "eks" {
       }
     }
 
+    # AL2023 node group utilizing new user data format which utilizes nodeadm
+    # to join nodes to the cluster (instead of /etc/eks/bootstrap.sh)
+    al2023_nodeadm = {
+      platform = "al2023"
+
+      cloudinit_pre_nodeadm = [
+        {
+          content_type = "application/node.eks.aws"
+          content      = <<-EOT
+            ---
+            apiVersion: node.eks.aws/v1alpha
+            kind: NodeConfig
+            spec:
+              kubelet:
+                config:
+                  shutdownGracePeriod: 30s
+                  featureGates:
+                    DisableKubeletCloudCredentialProviders: true
+          EOT
+        }
+      ]
+    }
+
     # Default node group - as provided by AWS EKS using Bottlerocket
     bottlerocket_default = {
       # By default, the module creates a launch template to ensure tags are propagated to instances, etc.,