Add GIT_HTTP_PROXY_AUTHMETHOD to kept environment variables

[VincentBerthier]

describe your issue

On the cluster I work on, there’s a proxy. It’s… Let’s just say that proxy is being a pain, and to make it work we have to set the environment variable GIT_HTTP_PROXY_AUTHMETHOD.

In pre_commit/git.py however, only a small subset of variables are kept, and that one is not among them. So, sure, I can (and did) edit the script to keep that one too (and it works now) but it’s not ideal.

pre-commit --version

pre-commit 2.17.0

.pre-commit-config.yaml

Not relevant

~/.cache/pre-commit/pre-commit.log (if present)

No response

[asottile]

sounds fine! would you like to send a PR?

[VincentBerthier]

Sure, it’s done.