Testing new version of the simple-game-server is super manual and annoying.

I had a thought today -- why don't we rebuild simple-game-server on each build and put a hash on it, and put it in one of the repositories that cleans itself up?

We could probably use the commit as the hash, and cache against it for rebuilds.

Then we tell the e2e test "use this build", which I'm 97% sure we have overrides for in the make commands.

I can't think of a huge downside tbh.

Thoughts?