from cognite.client.data_classes import WorkflowTask, FunctionTaskParameters
task = WorkflowTask(
    external_id="my_workflow-task1",
    parameters=FunctionTaskParameters(
        external_id="cdf_deployed_function:my_function",
        data={"workflow_data": "${workflow.input}"}))

res = client.workflows.executions.run("foo", "1")

res = client.workflows.executions.run("foo", "1", input={"a": 1, "b": 2})

import os
from cognite.client.data_classes import ClientCredentials
credentials = ClientCredentials("my-client-id", os.environ["MY_CLIENT_SECRET"])
res = client.workflows.executions.run("foo", "1", client_credentials=credentials)