echo "deb http://ftp.de.debian.org/debian trixie main" > /etc/apt/sources.list.d/trixie.list

{
echo 'Package: dnscrypt-proxy
Pin: release n=trixie
Pin-Priority: 500

Package: *
Pin: release n=trixie
Pin-Priority: 1
'
} > /etc/apt/preferences.d/trixie.pref