ci: publish on stackblitz

[hanspagel]

This PR adds a workflow to publish packages pre-release on stackblitz. Makes testing real-world scenarios pre-release easier! :)

[changeset-bot]

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Latest commit: b726ea2

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[netlify]

✅ Deploy Preview for scalar-snippetz ready!

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[hanspagel]

Can’t hurt, but needed to test the upcoming release. I’m skipping the queue on this. 👀