Add AUDIT_CERT_CUTOFF_DATE setting.

See https://github.com/edx/edx-platform/pull/11502

playbooks/roles/edxapp/defaults/main.yml

@@ -117,6 +117,9 @@ EDXAPP_CREDIT_HELP_LINK_URL: ""
 
 EDXAPP_PARTNER_SUPPORT_EMAIL: ''
 
+# ISO-8601 formatted date string, or null
+EDXAPP_AUDIT_CERT_CUTOFF_DATE: null
+
 EDXAPP_PLATFORM_NAME: 'Your Platform Name Here'
 EDXAPP_STUDIO_NAME: 'Studio'
 EDXAPP_STUDIO_SHORT_NAME: 'Studio'
@@ -893,6 +896,7 @@ lms_env_config:
   ELASTIC_SEARCH_CONFIG: "{{ EDXAPP_ELASTIC_SEARCH_CONFIG }}"
   MAILCHIMP_NEW_USER_LIST_ID: "{{ EDXAPP_MAILCHIMP_NEW_USER_LIST_ID }}"
   CONTACT_MAILING_ADDRESS: "{{ EDXAPP_CONTACT_MAILING_ADDRESS }}"
+  AUDIT_CERT_CUTOFF_DATE: "{{ EDXAPP_AUDIT_CERT_CUTOFF_DATE }}"
 
 cms_auth_config:
   <<: *edxapp_generic_auth