更换edx-platform 的git版本

playbooks/edx_sandbox.yml

@@ -18,7 +18,7 @@
   vars:
     migrate_db: "yes"
     EDXAPP_LMS_NGINX_PORT: '80'
-    edx_platform_version: 'master'
+    edx_platform_version: 'open-release-mongol/ginkgo.2'
     # Set to false if deployed behind another proxy/load balancer.
     NGINX_SET_X_FORWARDED_HEADERS: True
     DISCOVERY_URL_ROOT: 'http://localhost:{{ DISCOVERY_NGINX_PORT }}'