log cron output to journal instead of sending mails

tasks/main.yml

@@ -66,5 +66,5 @@
   cron:
     name: "mailman ldap sync"
     user: www-data
-    job: /usr/bin/django-admin syncldapusers --pythonpath /usr/share/mailman3-web --settings settings; /usr/bin/django-admin syncldapmemberships --pythonpath /usr/share/mailman3-web --settings settings
+    job: /usr/bin/django-admin syncldapusers --pythonpath /usr/share/mailman3-web --settings settings 2>&1 | /usr/bin/logger -t "mailman-ldapsync"; /usr/bin/django-admin syncldapmemberships --pythonpath /usr/share/mailman3-web --settings settings 2>&1 | /usr/bin/logger -t "mailman-ldapsync"
     minute: "*/15"