Set Multi-Arch to foreign
This allows the krb5-config package to be used as a dependency of architecture-dependent packages, like krb5-user.
For example, with this fix the following will work on an amd64 host:
sudo dpkg --add-architecture i386
sudo apt update
sudo apt install krb5-user:i386
This is similar to krb5!4 (merged), and Ubuntu needs that change due to its phasing out of the i386 architecture. See https://lists.ubuntu.com/archives/ubuntu-devel/2019-December/040859.html and similar threads for details.
I realize this is not an immediate problem for Debian, but we would like to keep the delta between these packages in Ubuntu and Debian to a minimum.
Thanks!