feat: add scripts for pre-flight checks and user input wait in k3s pipeline

gcloud/tf/scripts/wait_for_user_input_dns.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+echo "Please configure DNS using the IP address from the previous stage."
+echo "you have 120 seconds."
+for i in {120..1}; do
+    echo -ne "Time remaining: $i seconds\r"
+    sleep 1
+done
+echo ""
+
+exit 0