Added support for proxy servers in all execution environments

[tylerohlsen]

Fixes #916

[tylerohlsen]

@decyjphr sorry for the ping, but would you be able to look this over this change?

[Copilot]

Pull request overview

This PR addresses issue #916, which reported that HTTP proxy settings (http_proxy/https_proxy environment variables) were not respected in the standard container/server execution environment. It extends proxy support — already implemented for the Lambda environment via lib/proxyAwareProbotOctokit.js — to cover the probot server and full-sync entry points as well.

Changes:

• Adds GHE_HOST and GHE_PROTOCOL to the centralized lib/env.js env config module so that the target base URL can be computed for proxy resolution.
• Uses proxy-from-env and undici's setGlobalDispatcher/ProxyAgent in index.js to route all outbound HTTP traffic through the configured proxy, conditioned on the GHE_HOST env var for GHE environments.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
lib/env.js	Exposes GHE_HOST and GHE_PROTOCOL from environment variables so they can be consumed centrally
index.js	Adds proxy initialization using proxy-from-env + undici global dispatcher to support proxy in non-Lambda environments

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