Obelisk docs should include the following two steps for installing Docker on Linux

[eloisezeng]

Obelisk docs: https://caltech-amber.github.io/obelisk/development.html#overview
Before running "newgrp docker," users should run "sudo groupadd docker" and "sudo usermod -aG docker $USER." Otherwise, the non-root user will lack the password that's required by "newgrp docker."
Source: https://docs.docker.com/engine/install/linux-postinstall/