Configurable local exec command for waiting until cluster is healthy (#701)

* Configurable local exec command for waiting until cluster is healthy

* readme

* line feeds

* format

* fix readme

* fix readme

* Configurable local exec command for waiting until cluster is healthy (#1)

* Configurable local exec command for waiting until cluster is healthy

* readme

* line feeds

* format

* fix readme

* fix readme

* change log

* Configurable local exec wait 4 cluster op (#2)

* Configurable local exec command for waiting until cluster is healthy

* readme

* line feeds

* format

* fix readme

* fix readme

* change log

* changelog (#3)

* Changelog (#4)

* changelog

* changelog

* simplify wait_for_cluster command

* readme

* no op for manage auth false

* formatting

* docs? not sure

* linter

* specify dependency to wait for cluster more accurately

cluster.tf

@@ -32,10 +32,20 @@ resource "aws_eks_cluster" "this" {
     aws_iam_role_policy_attachment.cluster_AmazonEKSServicePolicy,
     aws_cloudwatch_log_group.this
   ]
+}
+
+resource "null_resource" "wait_for_cluster" {
+  count = var.manage_aws_auth ? 1 : 0
+
+  depends_on = [
+    aws_eks_cluster.this[0]
+  ]
+
   provisioner "local-exec" {
-    command = <<EOT
-    until curl -k -s ${aws_eks_cluster.this[0].endpoint}/healthz >/dev/null; do sleep 4; done
-  EOT
+    command = var.wait_for_cluster_cmd
+    environment = {
+      ENDPOINT = aws_eks_cluster.this[0].endpoint
+    }
   }
 }