Support wildcards in email domain whitelisting #20255
Description
Feature Description
Was working on setting up a semi-private gitea site that limited registration to just the main Government of Canada(GC) email domains. There are primarily two email TL domains associated with the GC, *.gc.ca and canada.ca.
A full list of .gc domains can be seen here.
When I tried to use a wildcard address in EMAIL_DOMAIN_WHITELIST I noticed that the * wildcard was not supported.
So I am requesting wildcard support in EMAIL_DOMAIN_WHITELIST. I have done some experimenting to see if and how this could be done.
https://go.dev/play/p/A7bV1R2g9jh
Unfortunatley I'm not a strong golan coder, so my pullrequest will probably not pass your QC and testing
Screenshots
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