All, Infra has implemented some permissions changes to the docker installation on the websites node, and all containers now map to the jenkins UID on the host. If you have specified a UID on the command line previously to avoid permissions issues, your build may now be broken. Please remove any docker run parameters you have which force a UID. The docker daemon will now ensure that files created on the host are owned by the jenkins user.
If you continue to have docker build troubles after removing those parameters, please let us know. -Chris