These are deploy.yml files for whiskey_disk deployments.
Note that whiskey_disk can read a deployment configuration YAML file directly over the web, so I can do, e.g.,:
% wd deploy --to=dotfiles:`hostname` --path=https://github.com/rick/deploy/raw/master/dotfiles.yml
On any machine that wants its dotfiles, and get them updated automatically.
Bonus points for using a config repository to protect AWS keys, passwords, etc.