* make gcp-linux example template use a non-root user
* don't try to create user account if it already exists
* upgrade to debian-10 image since debian-9 is no longer available
* Initial support for metadata in provisioner API and Terraform provisioner
* add support for nullable metadata fields
* handle metadata fields in provisionerd and API
* Pass workspace owner email address to provisioner
* Remove owner_email and owner_username fields from agent metadata
* Add Git environment variables to example templates
* Remove "owner_name" field from provisioner metadata, use username instead
* Remove Git configuration from most templates, add documentation
* Proofreading/typo fixes from @mafredri
* Update example templates to latest version of terraform-provider-coder
* return parameters from Terraform provisioner in sorted order
* persist parameter indices in database and return them in correct order from API
* don't re-sort parameters by name when creating templates