Add --setup-repo option to configure repositories without installing packages #605

Job	Run time
test (ubuntu:22.04, 27.5)	5s
test (quay.io/centos/centos:stream9, 27.5)	6s
test (ubuntu:24.04)	6s
test (quay.io/centos/centos:stream9)	9s
test (ubuntu:22.04)	13s
test-install-rootless	11s
test (ubuntu:24.04, 27.5)	6s
	56s

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