Add support for using an attached GCE service account #827
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Support using service accounts that are attached to a GCE instance, rather than requiring a service account key to be present.
The
gcloud-aio
library supports using a service account that is assigned to a VM by default just by omitting theservice_file
parameter (or by setting it toNone
).Removing this requirement means that the service account key does not need to be manually rotated, as the assigned service account credentials provided by the GCE metadata API are automatically rotated frequently.
Closes: #833