add nagios to docker if exists

tasks/configure.yml

@@ -1,13 +1,15 @@
 ---
-# - name: Ensure Nagios is configured
+- name: Check if docker group exists
-#   template:
+  shell: grep docker /etc/groups
-#     dest: /etc/nagios4/nagios.cfg
+  register: docker_group
-#     src: templates/nagios.cfg.j2
+
-#     owner: "{{ nagios_user }}"
+- name: Add nagios to docker group if it exists
-#     group: "{{ nagios_group }}"
+  user:
-#     mode: 0660
+    name: nagios
-#     backup: yes
+    append: true
-#   notify: Restart Nagios4
+    groups:
+      - docker
+  when: docker_group.rc == 0
 
 - name: Ensure folder for Nagios configurations exists
   file: