Certbot: Daily check for new certificates to avoid useless mails from LE

letsencrypt/files/certbot.timer

 [Unit]
-Description=Weekly timer to renew letsencrypt certificates
+Description=Timer to renew letsencrypt certificates
 
 [Timer]
-OnCalendar=weekly
+OnCalendar=daily
 Persistent=true
 Unit=certbot.service