Is your feature request related to a problem?

• Disallow writing path input to lock file #12004
• Remove the flake registry or diminish its role #7422

Proposed solution

See #7422 (comment)

• Ignore system and user registry in nix flake lock / update
• Keep using system and user registry in nix build <installable>

Alternative solutions

Additional context

Checklist

• checked latest Nix manual (source)
• checked open feature issues and pull requests for possible duplicates

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