Caching Docker layers seems to cause issues

[nano-o]

Hi Jared, thanks for setting up the CI!
I noticed the following issue: it succeeds on commit 4b8aa79 but fails on commit 53a61e6. The only different is that caching is disabled in the former.

[nano-o]

I ran into the same issue on branch fix-keygen-patch, where caching is disabled. So it's something else, which seems exacerbated by caching. Last time, when I tried to diagnose it, I used https://github.com/mxschmitt/action-tmate to get a shell right before docker-compose run blst, and the problem didn't show up in the interactive shell...

[brianhuffman]

I just ran into this exact same problem while trying to run docker-compose build in a local clone of the blst-verification repo. A fix along the lines of GaloisInc/saw-script#1107 might be in order.

[nano-o]

Okay, so if I understand correctly, the fix is to always prepend "apt-get update && " to any "apt-get install" command, in order to make sure it's not using a stale apt cache.