improve documentation on how to authenticate to GCP from TFC/TFE

[moosterhof]

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Description

Make it clear how to authenticate to GCP from TFC/TFE.

https://registry.terraform.io/providers/hashicorp/google/latest/docs/guides/getting_started#adding-credentials

The Getting Started guide should contain the process of setting up the GCP provider from TFC/TFE, not just from the command line.

The JSON file containing credentials approach does not work from TFC/TFE, and instead the contents of this JSON need to be put in the GOOGLE_CREDENTIALS environment variable. This is documented in the full provider reference (https://registry.terraform.io/providers/hashicorp/google/latest/docs/guides/provider_reference) but it's buried deep in the reference.

New or Affected Resource(s)

• documentation

Potential Terraform Configuration

References

• https://registry.terraform.io/providers/hashicorp/google/latest/docs/guides/provider_reference
• https://registry.terraform.io/providers/hashicorp/google/latest/docs/guides/getting_started#adding-credentials

[github-actions[bot]]

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