Followup for #432

I'm working on integrating knip into the typescript-eslint repo (typescript-eslint/typescript-eslint#8192)

We have GH workflow step that runs in the specified working-directory. Unfortunatelly, knip doesn't understand this syntax right now and reports stylelint as unused binary

Unlisted binaries (1)
stylelint  .github/workflows/ci.yml

GitHub Docs: Workflow syntax for GitHub Actions

I thought about sending a PR, but I couldn't find an example in the code of existing plugins on how to handle similar situtations (monorepo dependency is referenced by file from repository root)