feat: configure mongodb firewall (#949)

Co-authored-by: Anish Lakhwara <anish+git@lakhwara.com>

ansible/playbooks/do_setup.yml

@@ -166,6 +166,16 @@
       ansible.builtin.set_fact:
         lb_id: "{{ lb_id_result.stdout | from_json | json_query('load_balancers[0].id') }}"
 
+  # FIREWALL
+  # ===========================================
+    - name: d_ocean | db | get db firewall list
+      ansible.builtin.command: doctl db firewalls list {{ db_uuid }} -o json
+      register: db_firewalls
+
+    - name: d_ocean | db | configure firewall for mongoDB
+      ansible.builtin.command: doctl db firewalls append {{ db_uuid }} --rule k8s:{{ my_cluster.data.id }}
+      when: "db_firewalls.stdout == []"
+
   # DNS
   # ===========================================
     - name: d_ocean | dns | grab loadbalancer ip using doctl