Add HTTPS_PROXY support for hatch publish

[seignovert]

Hi,

I'm facing timeout issue on my university gitlab-ci which seems to be related to the proxy configuration not being detected by hatch:

$ echo $HTTPS_PROXY
https://proxy-server.tld:xxxx/

$ hatch publish
...
Error uploading to repository: https://test.pypi.org/legacy/ - [Errno 99] Address not available

When I use the same configuration outside the university (without the proxy) everything works as expected.

This issue does not appear with twine which have HTTPS_PROXY build-in support.

Would it be possible to do the same on hatch publish?
Thanks!