The ensemble.py program shows how to run native python functions as Work Queue
tasks.

To run:

1. Install CCTools, and the dill python module. For example, using conda:
conda create --yes --name work_queue_env python=3.8 dill
conda install --yes --name work_queue_env install --channel=conda-forge ndcctools
conda activate work_queue_env

2. Execute: python ensemble.py
3. Start workers, such as: work_queue_worker localhost 9123

This example assumes that the worker is executed inside a valid python
environment. (For example, that the conda environment work_queue_env or similar
is available at the worker's execution site.)