Proxy environment variables are ignored by Octokit API requests

[tcottin]

Description

I tried using the action in a github enterprise environment.

Our runners need to go through a proxy to reach the GHES instances.
The runners are configured correctly to set the required http_proxy/https_proxy environment variables.

When the action is triggered I get the error:

Using JSON configuration from 'config' input.
(node:271) [DEP0169] DeprecationWarning: `url.parse()` behavior is not standardized and prone to errors that have security implications. Use the WHATWG URL API instead. CVEs are not issued for `url.parse()` vulnerabilities.
(Use `node --trace-deprecation ...` to show where the warning was created)
Warning: Failed to set reaction on comment ID 52435.
Command 'ping-local' to be dispatched.
Error: getaddrinfo ENOTFOUND <ghes-instance>.com

Expected Behaviour

When http_proxy/https_proxy are set, API requests should be sent through the configured proxy.

AI Assisted Analysis

With the help of AI I could figure out that in the autoProxyAgent function, the Octokit request is currently configured to use HttpProxyAgent.
But the current Octokit request stack uses Fetch-compatible requests and therefore the Node.js HTTP(S) agents are not used by the underlying transport.
AI suggested to configure Octokit with an Undici Fetch implementation using EnvHttpProxyAgent as its dispatcher.
This worked for me.