Comment by naikrovek

if GitHub Enterprise Server is anything to go by, they build (almost) everything for containers, and the entire site is hosted by containers managed by Nomad. So there are probably lots of older images around that they can fall back on if the latest image of any container causes problems.

How they would deploy the older container, I don't know.

A lot of this is guesswork, I don't work for them or anything. And I know that GHES in the way that my employer manages it is very unlike the way that GitHub host github.com, so everything i've assumed could be wrong.