Feature Request: Add `.gitignore` to `build-dir`

[augusew1]

Hello,

This could be a misconfiguration on my part, but I am building a wheel file with

python3 -m build --wheel -Cbuild-dir=builddir

and unlike building with meson directly, I do not see a .gitignore ( or .hgignore) file in builddir. Specifically I see this building with

• meson 1.5.0
• meson-python 1.16.0
• build 1.2.1

I'm interested in keeping a semi-permanent build directory around because build times on Windows are exceedingly large, and the .gitignore file that meson usually puts in the build directory is a nice quality of life. For now I've added builddir to the project's .gitignore file but this doesn't scale very well since we use this on multiple platforms and multiple python versions.

I can reproduce this by building one of the listed examples on:

• mingw64 (unsupported python)
• Windows (official python)
• RHEL9