Allow extra domains for letsencrypt

[strarsis]

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Feature Request

Sometimes extra certificates from Let's Encrypt are needed.
Because nginx is the only validation endpoint on the Trellis server and is managed by ansible,
it would be great if it is possible to specify extra certificates to be requested/renewed.

Currently I modified the existing letsencrypt role a bit and append an extra list, going around the existing has changed checks - but the whole thing is quite brittle.

[swalkinshaw]

Seems useful 👍 Makes more sense now that Trellis supports arbitrary Nginx sites too.

[hemang-ajmera]

This feature is requested long back. Is this still in plans?

[swalkinshaw]

It's not a priority for us but anyone is welcome to contribute this feature