Add support for ignoring files about gersemi HOT 2 CLOSED

I found out the real source of my issue, it seems that clang-format and VSCode have some interaction that triggers the reconfiguration after I run pre-commit. Everything works as expected when building the project through the command line.

I will close the issue as gersemi is working fine, and I do not have any other use case for ignoring files.

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I'm not sure if it's really necessary to do that for this case in particular. Honestly I consider placing build directory inside project directory an anti-pattern because I've seen instances where it led to problems while out-of-project build was usually more robust because you have to avoid baking in assumptions about build directory.

Having said that, let's assume that you have a good reason to go with such directory layout. If I'm reading pre-commit doc correctly then you could avoid this by not using --all-files since you're interested only in proper formatting of staged files:

Some example useful invocations:
pre-commit run: this is what pre-commit runs by default when committing. This will run all hooks against currently staged files.
pre-commit run --all-files: run all the hooks against all the files. This is a useful invocation if you are using pre-commit in CI.
pre-commit run flake8: run the flake8 hook against all staged files.

Another thing is that pre-commit itself offers providing pattern for excluding certain files through exclude key so you could improve your experience through that configuration. Disclaimer: I'm not using pre-commit daily so if I've misread docs about these two pre-commit features please let me know.

If there was a stronger example provided for implementing this kind of feature we could discuss that.

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