So this is annoying - I assumed it was related to docker not picking up the github env - so I forked the repo, tried to make a failing test in my org, and then fix it......
mac/linux x86 worked, linux arm isn't running - no code changes of substance.
I wonder if our org limits are just too high or something - compared to my personal account.
I'm going to try to get this failing and then see if adding in the token to the docker env helps