added container (docker) functionality to the run statement

[Acribbs]

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[Acribbs]

@david-cgat was this functionality that you had in mind? My other suggestion was to also include something like

# Configure container support
P.set_container_config(
    image="ubuntu:20.04",
    volumes=[
        "/data:/data",
        "/reference:/reference"
    ],
    env_vars={
        "THREADS": "4",
        "PATH": "/usr/local/bin:$PATH"
    }
)

So that you can use a container for the full pipeline. Then each task doesnt have to worry about what type of container is being ran and it doesnt need to be set for each function. Would be useful for small lightweight pipelines