Installing Ansible role dependencies

I have a monolithic Ansible playbook that contains dozens of different roles, all bundled into the same Git repository. Some of the roles are more generically useful than others, so I thought I would do some refactoring.

I decided to move the role that installs and configures fail2ban to its own repository, and then call that new/refactored role as a dependency in my now-slightly-less-monolithic role.

Of course, I had no idea what I was doing.
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