docs: add warning about ruff on linux

Author: python357-1

CONTRIBUTING.md

@@ -95,6 +95,9 @@ A Python linter and code formatter. Ruff uses the `pyproject.toml` as its config
 - Lint code by moving into the `/tagstudio` directory with `cd tagstudio` and running `ruff --config ../pyproject.toml`.
 - Format code with `ruff format` inside the repository directory
 
+> [!CAUTION]
+> At least one contributor has had issues with running ruff on Linux this way. If when you run ruff, you are getting more or different formatting issues than appear in CI, try running `ruff <command> --config pyproject.toml` in the directory you cloned TagStudio in (i.e. one directory above `/tagstudio`).
+
 Ruff is also available as a VS Code [extension](https://marketplace.visualstudio.com/items?itemName=charliermarsh.ruff), PyCharm [plugin](https://plugins.jetbrains.com/plugin/20574-ruff), and [more](https://docs.astral.sh/ruff/integrations/).
 
 ### [Mypy](https://github.com/python/mypy)