integrate working with keyFiles

defaults/main.yml

@@ -23,3 +23,4 @@ mongodb:
     keep_days: 2
   replicaset: {}
   user: {}
+  keyfile_contents: ""

tasks/main.yml

@@ -3,6 +3,15 @@
     executable: pip3
     name: pymongo
 
+- name: template keyfile if necessary
+  copy:
+    dest: "{{ mongodb.config.security.keyFile }}"
+    content: "{{ mongodb.keyfile_contents }}"
+    owner: mongodb
+    group: mongodb
+    mode: "0600"
+  when: mongodb.keyfile_contents and mongodb.config.security.keyFile
+
 - name: copy mongodb config
   notify:
   - restart mongodb