Add a script to view netgraph's graphviz output.

ansible/roles/jail/files/netgraph_view

@@ -0,0 +1,2 @@
+#!/usr/bin/env zsh
+imv =(sudo ngctl dot | dot -Tsvg)

ansible/roles/jail/tasks/freebsd.yaml

@@ -90,6 +90,18 @@
     state: absent
   when: jail_list|community.general.json_query('[?enabled==`true`]')|length == 0
 
+- name: Install scripts
+  when: install_graphics
+  copy:
+    src: "files/{{ item.src }}"
+    dest: "{{ item.dest }}"
+    mode: 0755
+    owner: root
+    group: wheel
+  loop:
+    - src: netgraph_view
+      dest: /usr/local/bin/netgraph_view
+
 - name: Install rc script
   when: netgraph_config is defined
   copy: