Make sure there's a working DNS server when bootstrapping

ansible_playbooks/setup-cluster.yml

@@ -1,4 +1,18 @@
 ---
+- name: Update DNS for bootstrapping with non-Nomad host
+  hosts: consul_instances
+  become: true
+  gather_facts: false
+  vars:
+    non_nomad_dns: 192.168.2.170
+
+  tasks:
+    - name: Add non-nomad bootstrap DNS
+      lineinfile:
+        dest: /etc/resolv.conf
+        create: true
+        line: "nameserver {{ non_nomad_dns }}"
+
 - name: Build Consul cluster
   hosts: consul_instances
   any_errors_fatal: true