fix: shutdown nscd when installing nix.

[jbgi]

workaround DeterminateSystems/nix-installer#622 (which also appears with https://github.com/NixOS/nix-installer)

[mergify]

Queued — the merge queue status continues in this comment ↓.

[jfroche]

For my understanding, on which distro did you face this problem ? I think I never saw this error on the current set of images we are testing here.

[jbgi]

never saw this error on the current set of images we are testing here.

It was a custom image based on debian-13 with nscd enabled.

[mergify]

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