copr-be-dev-aws: test ansible PG plugin #6

Relates: https://pagure.io/fedora-infrastructure/issue/8675

playbooks/groups/copr-backend.yml

@@ -2,7 +2,6 @@
   hosts: copr_back_dev_aws
   user: root
   gather_facts: True
-  become: false
 
   vars_files:
    - /srv/web/infra/ansible/vars/global.yml
@@ -10,6 +9,11 @@
    - /srv/web/infra/ansible/vars/fedora-cloud.yml
    - /srv/private/ansible/files/openstack/passwords.yml
 
+  vars:
+    ansible_become: false
+    ansible_become_user: root
+    ansible_become_method: sudo
+
   tasks:
   - name: try become with potsgres ansible plugin
     postgresql_db: name="coprdb" encoding='UTF-8'