Update GCS backend docs for TF >=0.12

[lnesteroff]

Updated GCS remote backend to include the >=0.12 remote backend data source formatting (incl .output before output name). The current documentation is not valid if it is run with TF >= 0.12

Fixes #

Target Release

1.4.0

Draft CHANGELOG entry

ENHANCEMENTS

backend/gcs:  Update documentation for usage of `gcs` with `terraform_remote_state` [GH-32065]

[crw]

Thanks for this submission!

[SarahFrench]

Hi @lnesteroff 👋 thanks for this update

This section of the docs is pretty old (6 years!) so there's a bunch of things that can be improved here. I went to go read up about the template provider used for this example config and I found that it has been deprecated and isn't recommended for use in newer versions of Terraform. Because of this, I'm thinking we should change the example to use a different resource so we don't encourage people to use it.

Would you be happy to update your PR with a new example resource that uses data from data.terraform_remote_state.foo? A simple example I thought of was the local_file resource (see example below) but you could pick a different resource if you'd like

resource "local_file" "foo" {
  content  = data.terraform_remote_state.foo.outputs.greeting
  filename = "${path.module}/outputs.txt"
}

The above is more of a nit than a required change- please feel free to not do if you don't have time. The only thing I think requires changes is updating output to outputs.

Cheers! - Sarah

[lnesteroff]

Good catch, updated both your suggestions

[SarahFrench]

Thanks! I'll get this merged now

[github-actions]

Reminder for the merging maintainer: if this is a user-visible change, please update the changelog on the appropriate release branch.

[github-actions]

I'm going to lock this pull request because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active contributions.
If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.