gcloud iam service-accounts set-iam-policy  \
 gitops-webinar@gitops-project-290611.iam.gserviceaccount.com terraform-gke-keyfile.json
The specified policy does not contain an "etag" field identifying a
specific version to replace. Changing a policy without an "etag" can
overwrite concurrent policy changes.

Replace existing policy (Y/n)?  Y

ERROR: (gcloud.iam.service-accounts.set-iam-policy) INVALID_ARGUMENT: Invalid JSON payload received. Unknown name "auth_provider_x509_cert_url" at 'policy': Cannot find field.
Invalid JSON payload received. Unknown name "auth_uri" at 'policy': Cannot find field.
Invalid JSON payload received. Unknown name "client_email" at 'policy': Cannot find field.
Invalid JSON payload received. Unknown name "client_id" at 'policy': Cannot find field.
Invalid JSON payload received. Unknown name "client_x509_cert_url" at 'policy': Cannot find field.
Invalid JSON payload received. Unknown name "private_key" at 'policy': Cannot find field.
Invalid JSON payload received. Unknown name "private_key_id" at 'policy': Cannot find field.
Invalid JSON payload received. Unknown name "project_id" at 'policy': Cannot find field.
Invalid JSON payload received. Unknown name "token_uri" at 'policy': Cannot find field.
Invalid JSON payload received. Unknown name "type" at 'policy': Cannot find field.
- '@type': type.googleapis.com/google.rpc.BadRequest
  fieldViolations:
  - description: "Invalid JSON payload received. Unknown name \"auth_provider_x509_cert_url\"\
      \ at 'policy': Cannot find field."
    field: policy
  - description: "Invalid JSON payload received. Unknown name \"auth_uri\" at 'policy':\
      \ Cannot find field."
    field: policy
  - description: "Invalid JSON payload received. Unknown name \"client_email\" at\
      \ 'policy': Cannot find field."
    field: policy
  - description: "Invalid JSON payload received. Unknown name \"client_id\" at 'policy':\
      \ Cannot find field."
    field: policy
  - description: "Invalid JSON payload received. Unknown name \"client_x509_cert_url\"\
      \ at 'policy': Cannot find field."
    field: policy
  - description: "Invalid JSON payload received. Unknown name \"private_key\" at 'policy':\
      \ Cannot find field."
    field: policy
  - description: "Invalid JSON payload received. Unknown name \"private_key_id\" at\
      \ 'policy': Cannot find field."
    field: policy
  - description: "Invalid JSON payload received. Unknown name \"project_id\" at 'policy':\
      \ Cannot find field."
    field: policy
  - description: "Invalid JSON payload received. Unknown name \"token_uri\" at 'policy':\
      \ Cannot find field."
    field: policy
  - description: "Invalid JSON payload received. Unknown name \"type\" at 'policy':\
      \ Cannot find field."
    field: policy