Is your feature request related to a problem?

Host paths are not reproducible, so they're not a good source for flake inputs.

• partitions: incompatible with flakes as inputs that use flake-parts hercules-ci/flake-parts#252 (comment)

Proposed solution

Disallow writing path input to lock file. Throw an error.
Maybe have a flag --allow-unreproducible-local-path-input for the use case where users are testing something locally and they can't pass --override-input for whatever reason (getFlake, non-interactive Nix use, direnv, not-great CLIs, etc).

Alternative solutions

Additional context

May also solve

• Untracked files excluded from flake even with "path:" input #11930

Checklist

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

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