[naikrovek]

you still have access to your source code, you just can't push. or pull, but you can sneakernet around that, or have a second remote set in the repo for just this occasion, so you can collaborate as a stop-gap measure while GH gets fixed up.

[LtWorf]

git works completely fine offline.

However I have a feeling that most companies are set up to download 50MiB of dependencies at every run, so a website being down makes the entire thing not work.