Create an app-config.json file in webpack

[roundhill]

Fix

This fixes #3228. It does not appear possible to do dynamic requires in webpack, so instead I'm proposing the app use an app-config.json file that gets created in the webpack build, using either the contents of config-local.json if it is present, otherwise it will use config.json using fs to detect if the file is present or not.

Test

• npm run dev
• Verify that an app-config.json file was created properly. (Try deleting your config-local.json file if present, it should update to whatever is in config.json)
• The electron and web app should both load up without errors.

[twstokes]

Buildkite artifact testing:

• macOS binary artifact ✅
• Windows binary artifact - x64 with installer: ✅
• Linux binary artifact - x64 Debian package: ✅

On both macOS and Windows I tested that I could log in (to further ensure that the config contained the proper keys).

[roundhill]

Did you find any info on why that fallback doesn't work? Do I have a different version of webpack installed or something?

No I'm not sure either, but it also seems that you can't have a require with a bad path anywhere in the code, as webpack needs to look for all of the required files to do its compression with.

[roundhill]

Closing in favor of #3232