Building Docker images with Gitlab CI may require User Namespace support

I tried to use buildah to build some Docker images for the network team to use for our CI with the Gitlab CI runner.

It looks like the build jobs fails because we don't have User Namespace support. See: https://gitlab.torproject.org/tpo/core/tor-ci-support/-/jobs/9686

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information