Add SUPPORT_SITE_LINK setting.

SWAT-92

playbooks/roles/edxapp/defaults/main.yml

@@ -267,6 +267,7 @@ EDXAPP_CMS_AUTH_EXTRA: "{{ EDXAPP_AUTH_EXTRA }}"
 EDXAPP_ENABLE_MKTG_SITE: false
 EDXAPP_MKTG_URL_LINK_MAP: {}
 EDXAPP_MKTG_URLS: {}
+EDXAPP_SUPPORT_SITE_LINK: ''
 EDXAPP_EDXMKTG_USER_INFO_COOKIE_NAME: "edx-user-info"
 # Set this sets the url for static files
 # Override this var to use a CDN
@@ -786,6 +787,7 @@ generic_env_config:  &edxapp_generic_env
   LANGUAGE_CODE: "{{ EDXAPP_LANGUAGE_CODE }}"
   MKTG_URL_LINK_MAP: "{{ EDXAPP_MKTG_URL_LINK_MAP }}"
   MKTG_URLS: "{{ EDXAPP_MKTG_URLS }}"
+  SUPPORT_SITE_LINK: "{{ EDXAPP_SUPPORT_SITE_LINK }}"
   CDN_VIDEO_URLS: "{{ CDN_VIDEO_URLS }}"
   PERFORMANCE_GRAPHITE_URL: "{{ PERFORMANCE_GRAPHITE_URL }}"