Automated workflows to generate age and spreading rate grids

[brmather]

Very few plate models have associated age grids or spreading rate grids:
https://gplates.github.io/gplately/#gplately.DataServer

My thinking is that we need some automated workflow to generate these for all plate models and plate model updates. We have a workflow in GPlately that does this in notebook 10-SeafloorGrids.ipynb. Only problem is that it can take several hours to produce a set of grids. This will timeout on GitHub Actions, but perhaps we can set up our own custom runner on Panthalassa or somewhere else.

I don't expect this to happen any time soon, but just opening this issue for us to think on and revisit sometime in the future...

[michaelchin]

Shall I convert this into a "Discussion"? This looks to me more like a discussion.