nginx_proxy: make existing "cert update watcher" script cron.daily instead of cron.hourly?

[thegareth]

Describe the issue you are experiencing

I use step-ca to issue certs for my internal sites, and it issues very short-lived certs of 1 day, rather than 90 days you'd get via lets encrypt.

I currently handle that by triggering a service reload to make it notice the change, but that creates a brief outage while that happens.

I was digging around in the plugin, and I noticed that it does check for the certs being updated, using a file date operations, making it very efficient. (nginx_proxy/rootfs/etc/periodic/daily/check_certificate_renewal).

If I just relied on that 'daily' seamless reload, I could experience short periods where the certificate expires, because it was renewed 30 minutes prior to the reload script running...

If that efficient script was hourly instead of daily, I'd not have to manually restart nginx service at all, and could run the heavier cert renew operation every 6 hours... with no downtime to the frontend

What type of installation are you running?

Home Assistant OS

Which operating system are you running on?

Home Assistant Operating System

Which add-on are you reporting an issue with?

NGINX Home Assistant SSL proxy

What is the version of the add-on?

3.5.0

Steps to reproduce the issue

1. use a short-lived CA to retrieve a cert (that lasts 24 hours)
2. rely on the existing daily reload mechanisms (nginx_proxy/rootfs/etc/periodic/daily/check_certificate_renewal)
3. experience a race condition where the certificate wasn't updated in time, and certificate expires)

System Health information

There are currently no repairs available

Anything in the Supervisor logs that might be useful for us?

No response

Anything in the add-on logs that might be useful for us?

No response

Additional information

If this was acceptable I could likely do a PR for it.

[github-actions]

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