nginx: Randomize delay for certbot

Running it too close to 00:00 UTC just leads to errors all the time.
Running it at other times work fine so let's randomize things.
Signed-off-by: Florian Pritz <bluewind@xinu.at>

roles/nginx/files/certbot-renewal.timer

@@ -3,6 +3,7 @@ Description=Daily renewal of Let's Encrypt's certificates
 
 [Timer]
 OnCalendar=daily
+RandomizedDelaySec=24h
 Persistent=true
 
 [Install]