Dear #yggdrasil service owners: do *not* merely add an Yggdrasil IPv6 address to your existing https website. It will always fail due to certificate mismatch and you can't get DV cert on Yggdrasil address.
Do create a HTTP-only mirror on Yggdrasil IPv6 or dedicated hostname - Yggdrasil already provides transport encryption so TLS is to some extent redundant.