Add BASE_COOKIE_DOMAIN settings for edxapp

CHANGELOG.md

@@ -319,3 +319,6 @@
 
 - Role: edxapp
   - Added `EDXAPP_VIDEO_IMAGE_SETTINGS` to configure S3-backed video images.
+
+- Role: edxapp
+  - Added `EDXAPP_BASE_COOKIE_DOMAIN` for sharing cookies across edx domains.

playbooks/roles/edxapp/defaults/main.yml

@@ -706,6 +706,9 @@ EDXAPP_ENTERPRISE_COURSE_ENROLLMENT_AUDIT_MODES:
 # The assigned ICP license number for display in the platform footer
 EDXAPP_ICP_LICENSE: !!null
 
+# Base Cookie Domain to share cookie across edx domains
+EDXAPP_BASE_COOKIE_DOMAIN: "{{ EDXAPP_LMS_SITE_NAME }}"
+
 #-------- Everything below this line is internal to the role ------------
 
 #Use YAML references (& and *) and hash merge <<: to factor out shared settings
@@ -1083,6 +1086,8 @@ generic_env_config:  &edxapp_generic_env
   HELP_TOKENS_BOOKS: "{{ EDXAPP_HELP_TOKENS_BOOKS }}"
   # License for serving content in China
   ICP_LICENSE: "{{ EDXAPP_ICP_LICENSE }}"
+  # Base Cookie Domain to share cookie across edx domains
+  BASE_COOKIE_DOMAIN: "{{ EDXAPP_BASE_COOKIE_DOMAIN }}"
 
   POLICY_CHANGE_GRADES_ROUTING_KEY: "{{ EDXAPP_POLICY_CHANGE_GRADES_ROUTING_KEY }}"