If your workflow involves services that integrate with GitHub, you should have a plan for when GitHub is not available. You've got your source code elsewhere, you should have docs and procedures for running the tests in your own dev environments and for utilizing whatever staging/deploy process you prefer without GitHub as an intermediary.

I continue to post comments like that because while I love GitHub, watching the community put all their eggs in GitHub's basket, especially when GitHub lives on top of a tool designed to avoid SPoFs, is concerning.