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.
This commit is contained in:
Paddy 2017-04-28 16:16:38 -07:00
parent 170b5cff3c
commit 9dffeddbb7
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@ -46,6 +46,10 @@ The following keys can be used to configure the provider.
* `GOOGLE_CLOUD_KEYFILE_JSON`
* `GCLOUD_KEYFILE_JSON`
The [`GOOGLE_APPLICATION_CREDENTIALS`](https://developers.google.com/identity/protocols/application-default-credentials#howtheywork)
environment variable can also contain the path of a file to obtain credentials
from.
* `project` - (Required) The ID of the project to apply any resources to. This
can be specified using any of the following environment variables (listed in
order of precedence):