add generate sitemaps

tasks/cron.yml

@@ -21,7 +21,7 @@
     name: "Update sitemaps"
     minute: "0"
     hour: "8,16"
-    job: "chronic {{ bin_dir }}/dspace checker -l -p"
+    job: "chronic {{ bin_dir }}/dspace generate-sitemaps"
     user: "tomcat"
 
 - name: "OAI import cron job"