Well known and well documented how to use KeyChain to “trust” the SSL certificate when setting up a new local site.
Have found that even with the certificate shown as trusted in KeyChain it doesn’t transfer immediately into a trust for the new site.
What is required is a OS restart. Not sure I have seen that mentioned so hope it helps if you encounter that with the likes of Ventura OS.
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What? No. That seems ridiculous. That is absolutely not true in “Monterey.”