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docs(external): add Terraform Cloud workspace instruction (#44)

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* Add note regarding terraform cloud execution mode

When configuring a workspace in Terraform Cloud, the execution mode defaults to "Remote". This is problematic for two reasons:
1. We use local files that are not in the terraform plan directory. This creates errors about being unable to local files where it is not immediately obvious why.
2. The remote (cloud) runner won't be able to access the kube cluster running on the internal network anyway, so any plan application will fail.

* Detail terraform cloud workspace setup
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Elliot Blackburn 2022-02-15 01:32:29 +00:00 committed by GitHub
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external/README.md
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@ -25,7 +25,13 @@ This layer will:
### Create Terraform workspace
TODO
Terraform is stateful, which means it needs somewhere to store it's state. The Terraform Cloud is one option for a state backend with a generous free tier perfect for a homelab.
1. Sign up for a [Terraform Cloud](https://cloud.hashicorp.com/products/terraform)
2. Create a workspace named `homelab-external`, this is the workspace where your homelab state will be stored.
3. Change the "Execution Mode" from "Remote" to "Local". This will ensure your local machine, which can access your lab, is the one executing the terraform plan rather than the cloud runners.
If you decide to use a different terraform backend, you'll need to edit the [external/versions.tf](./versions.tf) file as required.
### Create Cloudflare API token