How to use the taskgraph.util.schema.taskref_or_string function in taskgraph

}

gradlew_schema = Schema({
    Required("using"): "gradlew",
    Optional("pre-gradlew"): [[text_type]],
    Required("gradlew"): [text_type],
    Optional("post-gradlew"): [[text_type]],
    # Base work directory used to set up the task.
    Required("workdir"): text_type,
    Optional("use-caches"): bool,
    Optional("secrets"): [secret_schema],
})

run_commands_schema = Schema({
    Required("using"): "run-commands",
    Required("commands"): [[taskref_or_string]],
    Required("workdir"): text_type,
    Optional("use-caches"): bool,
    Optional("secrets"): [secret_schema],
})


@run_job_using("docker-worker", "run-commands", schema=run_commands_schema)
def configure_run_commands_schema(config, job, taskdesc):
    run = job["run"]
    pre_commands = [
        _generate_secret_command(secret) for secret in run.get("secrets", [])
    ]
    all_commands = pre_commands + run.pop("commands", [])

    run["command"] = _convert_commands_to_string(all_commands)
    _inject_secrets_scopes(run, taskdesc)

                Required("taskId"): taskref_or_string,
                # type of signing task (for CoT)
                Required("taskType"): text_type,
                # Paths to the artifacts to sign
                Required("paths"): [text_type],
                # Signing formats to use on each of the paths
                Required("formats"): [text_type],
            }
        ],
    },
)
def build_scriptworker_signing_payload(config, task, task_def):
    worker = task["worker"]

    task_def["tags"]["worker-implementation"] = "scriptworker"

    task_def["payload"] = {

            Required("taskId"): taskref_or_string,
            Required("taskType"): text_type,
            Required("paths"): [text_type],
        }],
        Required("channel"): text_type,
        Required("target-store"): text_type,
        Required("product"): text_type,
        Required("dep"): bool,
    }
)
def build_push_apk_payload(config, task, task_def):
    worker = task["worker"]
    task_def["tags"]["worker-implementation"] = "scriptworker"

    task_def["payload"] = {
        "target_store": worker["target-store"],
        "upstreamArtifacts": worker["upstream-artifacts"],