add fb and tw accounts to generic_env_config

playbooks/roles/edxapp/defaults/main.yml

@@ -965,6 +965,8 @@ generic_env_config:  &edxapp_generic_env
     user: '{{ edxapp_sandbox_user }}'
   AFFILIATE_COOKIE_NAME: "{{ EDXAPP_AFFILIATE_COOKIE_NAME }}"
   ELASTIC_SEARCH_CONFIG: "{{ EDXAPP_ELASTIC_SEARCH_CONFIG }}"
+  PLATFORM_TWITTER_ACCOUNT: "{{ EDXAPP_PLATFORM_TWITTER_ACCOUNT }}"
+  PLATFORM_FACEBOOK_ACCOUNT: "{{ EDXAPP_PLATFORM_FACEBOOK_ACCOUNT }}"
 
 lms_auth_config:
   <<: *edxapp_generic_auth