gcp: Modify GCP provider to fallback to ADC if gcp_service_account_key
is not set [#531]
#532
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This change updates the authentication logic in the GCP provider to fallback and use application default credentials when authenticating with GCP instead of requiring that
gcp_service_account_key
be set in the provider configuration. Using ADC by default is the default behavior for the Google Cloud SDK and most applications that call GCP APIs.Using ADC also allows
cloudlist
to authenticate with GCP using temporary credentials when running on workloads in GCP instead of using static credentials (something Google recommends against).