Add GitHub Action to generate GIFs for all datasets/shapes when someone adds a new one in a PR

[stefmolin]

Is your feature request related to a problem? Please describe. When testing a new dataset or shape that someone proposes, I have to run the transformations on every possible combination with that shape or dataset.

Describe the solution you'd like I would like to have a GitHub Action that only runs when a new dataset or shape is added and creates an artifact with all of the GIFs that I can review.

Additional context A good starting point would be to enable passing all as a dataset (data-morph --start-shape all).

[JohnAZoidberg]

/take

[JohnAZoidberg]

Goal:

• [x] Generate morphs
  • [x] Run one morph if core code changed
  • [x] Run 1 to N if dataset added or changed
  • [x] Run N to 1 if shape added or changed
• [x] Upload as GH actions artifact
• [ ] Upload as a comment on the PR