Describe the bug

Trying to access a flake though a symlink fails with the following error:

error: path '/tmp/nixfiles' is not a flake (because it's not a directory)

Steps To Reproduce

1. Create a symlink to a flake.
2. Try to build a derivation through the symlink.

$ ln -s ~/Projects/nixfiles/ /tmp/nixfiles
$ nix build /tmp/nixfiles#hello
error: path '/tmp/nixfiles' is not a flake (because it's not a directory)

Expected behavior

It should resolve the symlink and work with the target directory

nix-env --version output

nix (Nix) 2.14.1

Priorities

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