allow disabling built-in nginx deployment

request-tracker/defaults/main.yml

 ---
-rt_enable_acmetool: False
+rt_enable_acmetool: false
+rt_enable_nginx: true
 rt_workers: 4

request-tracker/tasks/main.yml

@@ -73,10 +73,19 @@
   tags:
     - rt
 
+- name: Have nginx packages installed
+  apt: 
+    name: nginx
+    state: present
+  when: rt_enable_nginx|default(True)
+  tags:
+    - rt
+
 - name: Have nginx config for RT installed
   template:
     src: nginx-rt.j2
     dest: /etc/nginx/sites-available/rt
+  when: rt_enable_nginx|default(True)
   tags:
     - rt
   notify:
@@ -86,6 +95,7 @@
   file:
     path: /etc/nginx/sites-enabled/default
     state: absent
+  when: rt_enable_nginx|default(True)
   tags:
     - rt
   notify:
@@ -96,6 +106,7 @@
     state: link
     src: /etc/nginx/sites-available/rt
     dest: /etc/nginx/sites-enabled/rt
+  when: rt_enable_nginx|default(True)
   tags:
     - rt
   notify:
@@ -137,9 +148,14 @@
   with_items:
     - rt4-fcgi
     - request-tracker4
-    - nginx
-  notify:
-    - restart RT
-    - restart nginx
+  tags:
+    - rt
+
+- name: Have nginx up und running
+  service:
+    name: nginx
+    state: started
+    enabled: yes
+  when: rt_enable_nginx|default(True)
   tags:
     - rt