Port git-prune fix into edxapp

playbooks/roles/edxapp/tasks/deploy.yml

@@ -34,12 +34,9 @@
     force=yes owner={{ edxapp_user }} mode=0600
   when: EDXAPP_USE_GIT_IDENTITY
 
-- name: git prune before checking out
-  shell: cd {{ edxapp_code_dir }} && git remote prune origin
+- name: set git fetch.prune to ignore deleted remote refs
+  shell: git config --global fetch.prune true
   sudo_user: "{{ edxapp_user }}"
-  notify:
-  - "restart edxapp"
-  - "restart edxapp_workers"
 
 # Do A Checkout
 - name: checkout edx-platform repo into {{ edxapp_code_dir }}