Add ruff cache.
ruff tool: https://github.com/charliermarsh/ruff
ruff is becoming a very popular tool often run in pre-commit and aim to replace Flake8 (plus dozens of plugins), isort, pydocstyle, yesqa, eradicate, pyupgrade, and autoflake, all while executing tens or hundreds of times faster than any individual tool.
The direnv project (https://direnv.net/ ) uses .envrc files for dynamically loading environment variables (or other settings) per directory using the user's shell.. As it can contain sensitive information, and is similar in goal as to .env etc, I think it is a good idea to exclude this by default as well.
First and foremost I think that requiring such a complicated gitignore for JetBrains IDEs is a failure on JetBrains part in structuring their project setting. I also feel that it should be included in the `Python.gitignore` due to its popularity and due to the frequency of requests. A quick search for `PyCharm` PRs shows 81 closed PRs requesting it be added and if searching for `.idea` you can see many more have been requested. However I understand the maintenance burden in including it when a user can manually merge the two files themselves so I understand why the maintainers have opted to maintain it seperately.
The main problem I see is that with many people adding the `Python.gitignore` at project creation through the Github UI and the `JetBrains.gitignore` being in the Global folder and makes it less discoverable than it should be.
This PR adds a comment for people adding the `Python.gitignore` directing them to the global `JetBrains.gitignore` which should solve this issue in a way that is acceptable for the maintainers, since comment-only sections already exist for `pyenv` and `pipenv`.
pip generated this folder for a few versions, as part of it's initial
implementation of PEP 517.
pip has not generated this folder for a few versions now, so it should
be OK to remove this from the standard gitignore file.
Cython extension modules built with `gdb_debug=True` spit out debug symbols in the `cython_debug` directory at the top level of the project. The files in this directory contain hardcoded paths and are not shareable/meaningful across environments, so I think it makes sense to include them in a default Python .gitignore.
