Comment 38 for bug 1944468

I think you have things a bit backwards there. You are using a Docker image that has clone3 enabled in its libc and the container runtime in the environment the github action is running in is the thing that is not supporting the clone3 syscall. Whether the glibc in Ubuntu 21.10 issues the clone3 syscall or not is entirely irrelevant to this.

What is relevant to your issue is where docker get their container runtime from. I've looked this up in the past but I can't remember the details now. I don't think it's the version that's in the Ubuntu 20.04 archives though (the update will the needed fix is in proposed now and will hopefully migrate to updates soon, which will help a lot of people facing this issue -- but not afaict github actions). Basically you need to watch https://github.com/actions/virtual-environments/issues/3812 I think.