ansible: fix nginx in Docker

* rm /etc/init.d/nginx
* ensure nginx user
* disable default example site

ansible/roles/nginx/tasks/main.yml

@@ -3,11 +3,21 @@
   apt:
     name: nginx
 
-- name: Start and enable nginx service
-  service:
+- name: Remove nginx from init.d (may conflict with systemd service)
+  file:
+    path: /etc/init.d/nginx
+    state: absent
+  when: is_docker
+
+- name: Update rc.d to reflect init.d removal
+  command:
+    cmd: update-rc.d nginx remove
+  when: is_docker
+
+- name: Create nginx user
+  user:
     name: nginx
-    state: started
-    enabled: true
+    create_home: false
 
 - name: Create nginx.conf file
   template:
@@ -35,6 +45,19 @@
     group: root
     mode: 0744
 
+- name: Disable nginx default site
+  file:
+    path: /etc/nginx/sites-enabled/default
+    state: absent
+  notify:
+    - Reload nginx
+
+- name: Start and enable nginx service
+  systemd_service:
+    name: nginx
+    state: started
+    enabled: true
+
 - name: Add logrotate config
   copy:
     src: logrotate