Write auth.json also for root user who doesn't know composer home

tasks/auth_json.yml

 ---
 
-- name: Configure github oauth token
+- name: "Ensure Composer Home for root"
+  file:
+    path='/root/.composer'
+    state='directory'
+
+- name: "Configure github oauth token"
   template:
     src: ".composer/auth.json.j2"
-    dest: "{{ composer_home_path }}/auth.json"
+    dest: "{{ item }}/auth.json"
+  with_items:
+    - '/root/.composer'
+    - '{{ composer_home_path }}'
   when: composer_github_oauth != false or composer_http_basic != false