Adding `letsencrypt_domains`

[nmashton]

Often we'd like to have a letsencrypt cert for multiple domains, e.g. www.example.com as well as example.com. As currently set up, letsencrypt will certify only the canonical domain at pillar['domain'] and nothing else.

It's pretty easy to get letsencrypt to do multiple domains: you just include multiple -d arguments.

A simple way to achieve this in Margarita is to create a variable letsencrypt_domains which can be optionally specified in Pillar as a list of alternative domains (defaulting to the single-item list with the canonical domain).

[dpoirier]

Can we add documentation of this to the dev docs and link to that pull request from here?

[nmashton]

Would the documentation belong in the dev docs or in the provisioning docs of the project template?

[nmashton]

PR for dev docs amendment submitted.

[dpoirier]

:key: