Option to disable check for new version call to https://api.rustdesk.com/version/latest

First of all, thanks for this great software.

Is your feature request related to a problem? Please describe.
It is not a super big issue but still I want to address it.
Since february the hbbs server has been calling https://api.rustdesk.com/version/latest, once a day, without any entry in the log that a new version is present. This is most likely just a feature that will be implemented on the api server side or maybe my icinga update check informed me faster and I did the update before the api call could receive a vaild update url.

Describe the solution you'd like
Option A)
Add a parameter to overwrite the update check url "https://api.rustdesk.com/version/latest"
Option B)
Add a parameter to opt-in or opt-out the version check.

Describe alternatives you've considered
Put api.rustdesk.com in /etc/hosts.
Add an outgoing firewall rule

Additional context
If there is chance that Option A will be implemented it would also be nice to have a description of the api interface of https://api.rustdesk.com/version/latest so this can be implemented locally.

Best Regards
Nicolas

Start by tracing where the hbbs server makes its daily request to https://api.rustdesk.com/version/latest and where server options are defined. Compare the opt-out and URL-override proposals, then verify the selected behavior and document the version endpoint if local overrides are supported.