`pattern` can traverse the entire filesystem

[Jake Goulding]

I included a leading / in my pattern field:

[workspace.metadata.dylint]
libraries = [
    { git = "https://github.com/shepmaster/snafu-lints", pattern = "/*/*" },
]

This attempted to access my actual root directory and files within. I'd have expected the file walking to be constrained to the git checkout.