Document GOOGLE_APPLICATION_CREDENTIALS support.
We've supported GOOGLE_APPLICATION_CREDENTIALS as an environment variable (it comes free with our OAuth2 client) but it has never been documented. Documenting it now to resolve #12626.
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@ -46,6 +46,10 @@ The following keys can be used to configure the provider.
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* `GOOGLE_CLOUD_KEYFILE_JSON`
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* `GOOGLE_CLOUD_KEYFILE_JSON`
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* `GCLOUD_KEYFILE_JSON`
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* `GCLOUD_KEYFILE_JSON`
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The [`GOOGLE_APPLICATION_CREDENTIALS`](https://developers.google.com/identity/protocols/application-default-credentials#howtheywork)
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environment variable can also contain the path of a file to obtain credentials
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from.
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* `project` - (Required) The ID of the project to apply any resources to. This
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* `project` - (Required) The ID of the project to apply any resources to. This
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can be specified using any of the following environment variables (listed in
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can be specified using any of the following environment variables (listed in
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order of precedence):
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order of precedence):
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