Prepare a docker/singularity image for setup

[amanmdesai]

Need to prepare docker/singularity image that consists of:

(1) Madgraph5 and Pythia8 (with the ability to run pythia8 via python)
(2) Whizard3

A single image is much better

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[stale]

This issue or pull request has been automatically marked as stale because it has not had recent activity. Please manually close it, if it is no longer relevant, or ask for help or support to help getting it unstuck. Let me bring this to the attention of @klieret @wdconinc @michmx for now.