New SSH Host Keys not in rotation yet?

GitHub's SSH key fingerprints - GitHub Docs lists the new Ed25519 and ECDSA hosts key checksum for github.com with the note that they’ll be supported beginning September 14, 2021 (48 days ago). They don’t seem be in rotation yet.

% ssh-keyscan -t ed25519,ecdsa,rsa,dsa github.com 2>&1 | awk '!/^#/ { print $2 }'
ssh-rsa
ssh-dss

I need to make a long term known_hosts file for a container image which I won’t be able to update for a good year. So, I was wondering if the public keys of the new host keys—not just the SHA256 hashes—were published somewhere.

Yes ,so how are you can help me set up as I key