setting env var for migration password.

playbooks/roles/edxapp/tasks/service_variant_config.yml

@@ -65,6 +65,8 @@
     chdir={{ edxapp_code_dir }}
     {{ edxapp_venv_bin}}/python manage.py lms syncdb --migrate --noinput --settings=aws_migrate
   when: fake_migrations is not defined and migrate_db is defined and migrate_db|lower == "yes"
+  environment:
+    DB_MIGRATION_PASS: "{{ EDXAPP_MYSQL_PASSWORD }}"
   sudo_user: "{{ edxapp_user }}"
   notify:
   - "restart edxapp"