Set up the cyhy user and group using an Ansible role at AMI build time

[mcdonnnj]

🚀 Feature Proposal

We should switch to setting up the cyhy user and group as part of the AMI build with Packer.

Motivation

Currently we set up the cyhy user and group using cloud-init. We should switch to creating this user as one of the first steps in the AMI build process since it is used throughout the configuration of these images.

Pitch

This aligns the AMIs built in this configuration more closely with the ones in the COOL system. It will also allow us to correctly set ownership of files created in later Ansible roles as needed.

Implementation notes

This will require a new Ansible role (something like ansible-role-cyhy-user). We will also need to implement adding the SSH public key as part of that role as it is also set up by cloud-init.

[mcdonnnj]

The user is now created at AMI build time but we should still move the functionality into an Ansible role.