Execute the script after certification request

[iTofu]

Is your feature request related to a problem? Please describe.

I need the functionality to execute a script after updating the certificate, so that the new certificate can be synchronized to CDN websites, such as qiniu.com.

Describe the solution you'd like

I hope that a title input box with the title "Execute the script after certification request. Script content:" can be added on the Add Let's Encrypt Certificate page. It would be better to provide a feature for customizing the certificate directory.

Describe alternatives you've considered

A script may be run to synchronize the certificate to the CDN website on a weekly schedule.

Additional context

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