SOPS GCP KMS IDS environment variable

  To encrypt or decrypt a document with GCP KMS, specify the
  GCP KMS resource ID in the --gcp-kms flag or in the SOPS_GCP_KMS_IDS
  environment variable.
  (you need to setup google application default credentials. See
   https://developers.google.com/identity/protocols/application-default-credentials)

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