add screens team users and fix docker installation #82
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This adds the other screens team members as SCU users so they can log in as well. Adds all users to the
docker
group.Also changes the docker installation steps to use a more standard pattern for adding the apt repo. I saw an intermittent failure on this step, where the package wasn't found, and it seemed like a timing issue around updating apt after adding the repo. Using the
apt_repository
builtin should behave better and handle the update automatically.