dns: Tweak dns role to work better with systemd-resolved #1540

Job	Run time
get-matrix	4s
fedora (registry.fedoraproject.org/fedora:39-x86_64, fedora-39)	25m 15s
fedora (registry.fedoraproject.org/fedora:40-x86_64, fedora-40, latest fedora-latest)	41m 2s
fedora (registry.fedoraproject.org/fedora:41-x86_64, fedora-41)	20m 9s
fedora (registry.fedoraproject.org/fedora:42-x86_64, fedora-42, rawhide)	19m 41s
other (quay.io/centos/centos:stream8, centos-8, samba)	22m 12s
other (quay.io/centos/centos:stream9, centos-9, centos-latest, samba)	22m 57s
other (quay.io/centos/centos:stream10-development, centos-10, samba)	13m 1s
other (docker.io/debian:12, debian-12, debian-latest, ipa ldap samba)	16m 52s
other (docker.io/ubuntu:latest, ubuntu-latest, ipa ldap samba)	24m 6s
other (docker.io/ubuntu:rolling, ubuntu-rolling, ipa ldap samba)	18m 16s
	3h 43m 35s

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