curl files from files.edx.org for jenkins worker

playbooks/roles/jenkins_worker/tasks/system.yml

@@ -17,18 +17,13 @@
   ignore_errors: yes
 
 - name: Get the authorized key that should be used for this machine.
-  authorized_key:
-    user: "{{ jenkins_user }}"
-    state: present
-    key: "{{ jenkins_worker_key_url }}"
+  shell: "curl {{ jenkins_worker_key_url }} -o {{ jenkins_home }}/.ssh/authorized_keys"
   when: jenkins_worker_key_url is defined
-  ignore_errors: yes
 
 - name: Set key permissions
   file:
     path={{ jenkins_home }}/.ssh/authorized_keys
     owner={{ jenkins_user }} group={{ jenkins_group }} mode=400
-  ignore_errors: yes
 
 - name: Install system packages
   apt: pkg={{','.join(jenkins_debian_pkgs)}}