ansible/hosts: add build2-deb11build-ansible

Add it to the config. I've used this to enable ipv6 in docker, so
libosmocore builds don't fail in the socket test when building rpm/deb
packages on that host in docker.

Related: OS#2385
Change-Id: Ibe8e2a638fcbc7c0a69c211385a870b1a82b6fef
1 file changed