WIP: initial work to simplify setup-dns #903

Job	Run time
runner-test (ubuntu-24.04)	10m 59s
container-test (ubuntu:latest)	10m 28s
runner-test (ubuntu-22.04)	11m 43s
login-shells-and-linting	2m 45s
container-test (fedora:latest)	10m 29s
fresh-macos-test (macos-14)	23m 14s
runner-test (macos-14)	24m 27s
container-test (debian:latest)	10m 40s
fresh-macos-test (macos-12)	34m 44s
runner-test (macos-12)	33m 7s
container-test (alpine:latest)	10m 21s
container-test (opensuse/leap)	13m 40s
container-test (opensuse/tumbleweed)	10m 15s
container-test (kalilinux/kali-rolling)	10m 37s
	3h 37m 29s

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