refactor: setup sudo permissions for nginx

Author: saitho

tasks/steps/setup.yml

@@ -1,5 +1,14 @@
 # This task list sets up Nginx during server setup
 ---
+- name: Ensure stackhead user can reload nginx
+  blockinfile:
+    path: '/etc/sudoers.d/stackhead'
+    block: |
+      %stackhead ALL= NOPASSWD: /bin/systemctl reload nginx
+    mode: 0440
+    create: yes
+    state: present
+    validate: 'visudo -cf %s'
 - name: Deploy additional h5bp Nginx files
   synchronize:
     src: "{{ module_role_path | default(role_path) }}/vendor/server-configs-nginx/h5bp"