Provide way to create Cloudformation template

[Deraen]

I'm not going to let any program access AWS with keys that can do lots of things. Maybe there is a way to create proper IAM role with only necessary policies to allow stack creation, but I don't know how that would work.

But good way allow stack creation manually would be to add option (or modify --dry-run) to print the CloudFormation JSON or Yaml template. User can then check the template is fine and create the stack from AWS Console.

Instead of pprint here, https://github.com/confetti-clj/confetti/blob/master/src/confetti/boot_confetti.clj#L193 this could call cheshire/generate-string or similar (with key-fn that converts snake-case to CamelCase). Amazonica probably already has a function to translate clj data to JSON.

[martinklepsch]

PR to print JSON on --dry-run would be welcome.

Also yeah, a policy that allows exactly whats needed would be nice but I haven't really looked into that yet.