[data-shapes] Add GitHub workflow to keep Turtle and JSON-LD examples sync (#318)

bergos has just created a new issue for https://github.com/w3c/data-shapes:

== Add GitHub workflow to keep Turtle and JSON-LD examples sync ==
As we use two serializations (Turtle, JSON-LD) in our examples, we should create a script that checks if both formats are in sync and add that script to a GitHub workflow.

Please view or discuss this issue at https://github.com/w3c/data-shapes/issues/318 using your GitHub account


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