fix(iac): K3s - fix kubeconfig extraction when run remotely

Author: alhendrickson

deployment/terraform/modules/openstack-kubernetes-infra/kubeconfig-extraction.tf

@@ -0,0 +1,28 @@
+resource "null_resource" "copy_kubeconfig" {
+  depends_on = [openstack_compute_instance_v2.kubernetes_server]
+
+  provisioner "local-exec" {
+    # Copy the kubeconfig file from the host to a local file using SCP.
+    # Use ssh-keyscan to prevent interactive prompt on unknown host
+    # Use sed to replace the localhost address in the KUBECONFIG file with the actual IP adddress of the created VM. 
+    command = <<EOT
+mkdir -p ${path.root}/.build/ && \
+ssh-keyscan -H ${openstack_compute_instance_v2.kubernetes_server.access_ip_v4} >> ${path.root}/.build/.known_hosts_cogstack && \
+scp -o UserKnownHostsFile=${path.root}/.build/.known_hosts_cogstack -o StrictHostKeyChecking=yes \
+    -i ${local.ssh_keys.private_key_file} \
+    ubuntu@${openstack_compute_instance_v2.kubernetes_server.access_ip_v4}:/etc/rancher/k3s/k3s.yaml \
+    ${local.kubeconfig_file} && \
+sed -i "s/127.0.0.1/${openstack_compute_instance_v2.kubernetes_server.access_ip_v4}/" ${local.kubeconfig_file}
+EOT
+  }
+}
+
+data "local_file" "kube_config_raw_file" {
+  filename = local.kubeconfig_file
+  depends_on = [ null_resource.copy_kubeconfig ]
+}
+
+output "kube_config_raw" {
+  value = data.local_file.kube_config_raw_file
+  description = "Kubeconfig for this cluster"
+}