terraform-provider-docker/testdata/resources/docker_service/testAccDockerServiceUpdateLabels.tf

provider "docker" {
  registry_auth {
    address = "127.0.0.1:15000"
  }
}

resource "docker_service" "foo" {
  name = "tftest-service-labels"

  labels {
    label = "env"
    value = "%s"
  }

  task_spec {
    container_spec {
      image             = "127.0.0.1:15000/tftest-service:v1@sha256:2ca4c7a50df3515ea96106caab374759879830f6e4d6b400cee064e2e8db08c0"
      stop_grace_period = "10s"
    }
  }
}