shift cron.daily / logrorate timer

logrotate.timer is:

```
$ sudo systemctl cat logrotate.timer
# /lib/systemd/system/logrotate.timer
[Unit]
Description=Daily rotation of log files
Documentation=man:logrotate(8) man:logrotate.conf(5)

[Timer]
OnCalendar=daily
AccuracySec=1h
Persistent=true

[Install]
WantedBy=timers.target
```

This should be amended via systemd override.

logrotate.timer has AccuracySec=1h, but I'm seeing it always happen really near 00:00, which if I'm

ubuntu@prod-archive-servers-1:~$ journalctl -b -u logrotate.service|grep Starting
Jul 12 00:00:13 prod-archive-servers-1 systemd[1]: Starting Rotate log files...
Jul 13 00:00:18 prod-archive-servers-1 systemd[1]: Starting Rotate log files...
Jul 14 00:00:24 prod-archive-servers-1 systemd[1]: Starting Rotate log files...
Jul 15 00:00:03 prod-archive-servers-1 systemd[1]: Starting Rotate log files...
Jul 16 00:00:01 prod-archive-servers-1 systemd[1]: Starting Rotate log files...
Jul 17 00:00:08 prod-archive-servers-1 systemd[1]: Starting Rotate log files...
Jul 18 00:00:01 prod-archive-servers-1 systemd[1]: Starting Rotate log files...
Jul 19 00:00:01 prod-archive-servers-1 systemd[1]: Starting Rotate log files...

ubuntu@prod-archive-servers-2:~$ journalctl -b -u logrotate.service|grep Starting
Jul 12 00:00:03 prod-archive-servers-2 systemd[1]: Starting Rotate log files...
Jul 13 00:00:03 prod-archive-servers-2 systemd[1]: Starting Rotate log files...
Jul 14 00:00:03 prod-archive-servers-2 systemd[1]: Starting Rotate log files...
Jul 15 00:00:01 prod-archive-servers-2 systemd[1]: Starting Rotate log files...
Jul 16 00:00:01 prod-archive-servers-2 systemd[1]: Starting Rotate log files...
Jul 17 00:00:03 prod-archive-servers-2 systemd[1]: Starting Rotate log files...
Jul 18 00:00:01 prod-archive-servers-2 systemd[1]: Starting Rotate log files...
Jul 19 00:00:01 prod-archive-servers-2 systemd[1]: Starting Rotate log files...

ubuntu@prod-archive-servers-3:~$ journalctl -b -u logrotate.service|grep Starting
Jul 12 00:00:06 prod-archive-servers-3 systemd[1]: Starting Rotate log files...
Jul 13 00:00:13 prod-archive-servers-3 systemd[1]: Starting Rotate log files...
Jul 14 00:00:07 prod-archive-servers-3 systemd[1]: Starting Rotate log files...
Jul 15 00:00:02 prod-archive-servers-3 systemd[1]: Starting Rotate log files...
Jul 16 00:00:01 prod-archive-servers-3 systemd[1]: Starting Rotate log files...
Jul 17 00:00:00 prod-archive-servers-3 systemd[1]: Starting Rotate log files...
Jul 18 00:00:08 prod-archive-servers-3 systemd[1]: Starting Rotate log files...
Jul 19 00:00:09 prod-archive-servers-3 systemd[1]: Starting Rotate log files...

The following cowboy has been installed on the production archive servers running jammy :

$ cat /etc/systemd/system/logrotate.timer.d/override.conf
[Timer]
OnCalendar=
OnCalendar=*-*-* 04:30:00
AccuracySec=1min

I'd recommend not calling the override file the charm adds override.conf, though, since that's the default for systemctl edit and I've seen cases where it gets stomped on in haste.