It is ready for testing phase, and your feedback could help to make the package more robust :)
I'll give you a little gif if it helps. (sorry my interface is in French)
Afterwards, simply click on it and create an ssl certificate with letsencrypt. (in my case the button is disabled because of my configuration of the virtual machine, but in your case it should be active)
Exact, ensuite quand tu installes Funkwhale tu choisis ton sous-domaine et v'la ^^
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