kind: Copying files/ to / before clean-install, fails base image build

What happened:

$ make -C images/base quick
...<redacted>...
#7 0.150 Installing Packages ...
#7 0.231 Err:1 http://archive.ubuntu.com/ubuntu groovy InRelease
#7 0.231   Something wicked happened resolving 'archive.ubuntu.com:80' (-5 - No address associated with hostname)
#7 0.231 Err:2 http://archive.ubuntu.com/ubuntu groovy-updates InRelease
#7 0.231   Something wicked happened resolving 'archive.ubuntu.com:80' (-5 - No address associated with hostname)
#7 0.231 Err:3 http://security.ubuntu.com/ubuntu groovy-security InRelease
#7 0.231   Something wicked happened resolving 'security.ubuntu.com:80' (-5 - No address associated with hostname)
#7 0.232 Err:4 http://archive.ubuntu.com/ubuntu groovy-backports InRelease
#7 0.232   Something wicked happened resolving 'archive.ubuntu.com:80' (-5 - No address associated with hostname)
...<redacted>...

What you expected to happen: base image is built successfully

How to reproduce it (as minimally and precisely as possible): This failed for me on my Google corp workstation, somehow works fine on Mac.

Anything else we need to know?:

This is most likely coming from us overwriting some of the /etc system files that we copy before running clean-install

https://github.com/kubernetes-sigs/kind/blob/426e03350adbe02b65cea8b4ddcfecd8b8119093/images/base/Dockerfile#L59

~wasn’t able to pinpoint which one exactly, best guess is https://github.com/kubernetes-sigs/kind/blob/main/images/base/files/etc/sysctl.d/10-network-security.conf affecting the networking somehow?~

Some weird interaction with / being the destination ?

Environment:

• kind version: (use kind version): HEAD
• Kubernetes version: (use kubectl version): N/A
• Docker version: (use docker info): 20.10.2
• OS (e.g. from /etc/os-release): Debian GNU/Linux

/cc @BenTheElder @aojea