tree a7dac029c71ff61e44332644c50cbdc35de537db
parent 12a6f48f3587a95ccfcf2c28d9f05e472b30b580
author Peter Collingbourne <pcc@google.com> 1743806399 -0700
committer GN LUCI <gn-scoped@luci-project-accounts.iam.gserviceaccount.com> 1744544089 -0700

Write .gitignore file to build directory

This causes build directories to be ignored by default by tools such as
git, jj and rg. The idea was taken from the Meson build tool [1].

[1] https://mesonbuild.com/FAQ.html#how-do-i-ignore-the-build-directory-in-my-vcs

Change-Id: Ic3e6589bce78079e98f9f413d1eb15692bb71649
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/18500
Commit-Queue: David Turner <digit@google.com>
Reviewed-by: Takuto Ikuta <tikuta@google.com>