[6.X] Allow web-multi-logger port to be configurable

[R-NK]

• I have read the contribution documentation for this project.
• I agree to follow the code of conduct that this project follows, as appropriate.
• I have searched the issue tracker for an issue that matches the one I want to file, without success.

Please describe your issue:
@electron-forge/web-multi-logger is using port 9000, but same port is used by VSCode Extension on my machine. When I run yarn run start without killing the vscode process, I got this error:

An unhandled exception has occurred inside Forge:
listen EADDRINUSE: address already in use :::9000
Error: listen EADDRINUSE: address already in use :::9000
    at Server.setupListenHandle [as _listen2] (net.js:1290:14)
    at listenInCluster (net.js:1338:12)
    at Server.listen (net.js:1425:7)
    at Function.serverListen [as listen] (/Users/right/workspace/electron/electron-react-ts/node_modules/express-ws/lib/index.js:42:40)
    at listen (/Users/right/workspace/electron/electron-react-ts/node_modules/@electron-forge/web-multi-logger/src/Logger.ts:46:30)
    at new Promise (<anonymous>)
    at Logger.start (/Users/right/workspace/electron/electron-react-ts/node_modules/@electron-forge/web-multi-logger/src/Logger.ts:45:12)
    at start (/Users/right/workspace/electron/electron-react-ts/node_modules/@electron-forge/plugin-webpack/src/WebpackPlugin.ts:414:18)
    at Generator.next (<anonymous>)
    at asyncGeneratorStep (/Users/right/workspace/electron/electron-react-ts/node_modules/@electron-forge/plugin-webpack/dist/WebpackPlugin.js:46:103)
    at _next (/Users/right/workspace/electron/electron-react-ts/node_modules/@electron-forge/plugin-webpack/dist/WebpackPlugin.js:48:194)
    at process._tickCallback (internal/process/next_tick.js:68:7)
  electron-forge:plugin:webpack handling process exit with: { cleanup: true } +2s
  electron-forge:plugin:webpack cleaning webpack watcher +1ms
  electron-forge:plugin:webpack cleaning http server +0ms
  electron-forge:plugin:webpack stopping logger +1ms

Would you allow this port to be configurable or are there any workarounds for this?

[MarshallOfSound]

PRs welcome 👍

The code in question is here --> https:/electron-userland/electron-forge/blob/master/packages/utils/web-multi-logger/src/Logger.ts

An environment variable probably makes the most sense here

[malept]

Also:

https:/electron-userland/electron-forge/blob/7abca7d357713d5bd70396bb1b206073cc9e053a/packages/plugin/webpack/src/WebpackPlugin.ts#L428

[R-NK]

Thank you for your reply, I'll address this issue.

[tborychowski]

I have this issue in a clean install of the latest version.

[malept]

@tborychowski what is "the latest version"?

[tborychowski]

@malept version 5.2.4

[malept]

As indicated in the issue title, this is for 6.x, not <= 5.

[tborychowski]

@malept In that case - sorry that I've got this problem in 5...

[malept]

Well that's weird mostly because this feature doesn't exist at all in < 6.