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When TerraForm is used to configure and deploy infrastructure applications that require dozens templated files, such as Kubernetes, it becomes extremely burdensome to template them individually: each of them requires a data source block as well as an upload/export (file provisioner, AWS S3, ...). Instead, this commit introduces a mean to template an entire folder of files (recursively), that can then be treated as a whole by any provider or provisioner that support directory inputs (such as the file provisioner, the archive provider, ...). This does not intend to make TerraForm a full-fledged templating system as the templating grammar and capabilities are left unchanged. This only aims at improving the user-experience of the existing templating provider by significantly reducing the overhead when several files are to be generated - without forcing the users to rely on external tools when these templates stay simple and that their generation in TerraForm is justified.