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feat: github-auth flag (#4926)

* feat: github-auth flag

This will allow injecting credentials into code-server if you already
have them.

* Update Code

Contains the GitHub auth changes.

* Add e2e test for GitHub token
A
Asher committed
0e78a147b6135bf1725c952cb2e0277344c26161
Parent: 3f3a489
Committed by GitHub <noreply@github.com> on 3/2/2022, 8:02:51 PM