Packages for MPD v0.23.12 are built for debian/amd64|arm64 and raspbian/armhf Bullseye.

You can add deb.kaliko.me to your source list to follow future builds.

Fore those already following the repo, remember to update the signing key, it will expire soon.

You can simply install it with apt (please refer to dedicated post):

apt install kaliko-archive-keyring