[Linux] Use the system's browser to log into GitHub

[probonopd]

Please use the system's browser to log into GitHub.

If an application like this one is asking for credentials, the user has no way of knowing what actually happens with them.

Here is an example of an application (distributed in AppImage format) that uses the system's browser to log into GitHub:

https://github.com/helio-fm/helio-workstation

AppImage:
https://ci.helio.fm/helio-dev-64-bit.AppImage

[brunolemos]

Hi! Yes, this is important.
Currently DevHub does this on all platforms except Linux.

I had issues when I tried (#79).
This is because devhub:// app scheme didn't work.

Please send a pull request if you know the fix.

[AndreTheHunter]

The fix for electron-userland/electron-builder#4035 has been merged ( electron-userland/electron-builder#4909). Any update on this issue?