Add RDE Staging to QA crontab. (#1210)

* Add RDE Staging to QA crontab.

core/src/main/java/google/registry/env/qa/default/WEB-INF/cron.xml

@@ -1,6 +1,17 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <cronentries>
 
+  <cron>
+    <url>/_dr/task/rdeStaging</url>
+    <description>
+      This job generates a full RDE escrow deposit as a single gigantic XML document
+      and streams it to cloud storage. When this job has finished successfully, it'll
+      launch a separate task that uploads the deposit file to Iron Mountain via SFTP.
+    </description>
+    <schedule>every day 00:07</schedule>
+    <target>backend</target>
+  </cron>
+
   <cron>
     <url><![CDATA[/_dr/cron/readDnsQueue?jitterSeconds=45]]></url>
     <description>