Give mongo migrate the variables it needs

Author: Nathan219

ansible/group_vars/alpha-api-base.yml

@@ -74,6 +74,12 @@ api_base_container_envs:
     value: "{{ krain_port }}"
   - name: MIXPANEL_APP_ID
     value: "{{ api_mixpanel_app_id }}"
+  - name: MONGO_AUTH
+    value: "{{ api_mongo_auth }}"
+  - name: MONGO_DB
+    value: "{{ api_mongo_database }}"
+  - name: MONGO_HOSTS
+    value: "{{ mongo_hosts }}"
   - name: MONGO_REPLSET_NAME
     value: "{{ api_mongo_replset_name }}"
   - name: MONGO