Proxy Support broken on Slack App approach (Slack Bot Token approach)

[frednntelia]

Description

When using the slack-github-action in GitHub App mode, the Action fails to utilize environment variables HTTPS_PROXY and https_proxy correctly.

What type of issue is this? (place an x in one of the [ ])

• [x] bug
• [ ] enhancement (feature request)
• [ ] question
• [ ] documentation related
• [ ] example code related
• [ ] testing related
• [ ] discussion

Requirements (place an x in each of the [ ])

• [x] I've read and understood the Contributing guidelines and have done my best effort to follow them.
• [x] I've read and agree to the Code of Conduct.
• [x] I've searched for any related issues and avoided creating a duplicate issue.

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Bug Report

Filling out the following details about bugs will help us solve your issue sooner.

Reproducible in:

package version: slackapi/[email protected]

node version:

OS version(s): Ubuntu 20.04 LTS

Steps to reproduce:

1. run slack-github-action behind a proxy
2. make sure you set HTTPS_PROXY and https_proxy env vars
3. use slack webhook method
4. observe success
5. use slack app method (slack bot token)
6. observe failure

Expected result:

HTTPS_PROXY var is respected and slack api call goes through properly, resulting in the display of a message on the respective channel.

Actual result:

Slack message never arrives in channel. Likely because HTTPS_PROXY env var is not being respected

Attachments:

[WARN]  web-api:WebClient:0 http request failed connect ETIMEDOUT 3.***.***.153:443
[WARN]  web-api:WebClient:0 http request failed connect ETIMEDOUT 18.***.***.***:443
[WARN]  web-api:WebClient:0 http request failed connect ETIMEDOUT 3.***.***.98:443
[WARN]  web-api:WebClient:0 http request failed connect ETIMEDOUT 3.***.***.98:443
[WARN]  web-api:WebClient:0 http request failed connect ETIMEDOUT 18.***.***.225:443
[WARN]  web-api:WebClient:0 http request failed connect ETIMEDOUT 3.***.***.98:443
[WARN]  web-api:WebClient:0 http request failed connect ETIMEDOUT 18.***.***.***:443
[WARN]  web-api:WebClient:0 http request failed connect ETIMEDOUT 3.***.***.153:443
[WARN]  web-api:WebClient:0 http request failed connect ETIMEDOUT 18.***.***.225:443
Error: The operation was canceled.