ci: enable preview and repo dispatch

[ematipico]

Changes

This PR creates two new workflows:

• one to create a preview release when a PR is open, a PR is merged into main, and there's a workflow dispatch (manually triggered). It uses pkg.pr.new
• one to dispatch an event when a PR is merged to main. This event is dispatched to withastro/starlight and withastro/adapters. These two repositories can subscribe to this event and enable continuous testing whenever we merge a PR.

The reason why I enabled the dispatch event only on push to main, is that it's not sustainable to trigger a test in other repositories at each commit.

Testing

This PR won't work until:

• we enable pkg.pr.new as application for this repository (ideally for the entire org, I will sync with Matthew)
• we create a PAT for dispatching the event

The usage of the PAT needs to be nested on main, so I will have to merge the PR.

Docs

N/A

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Latest commit: 62c1877

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[pkg-pr-new]

commit: 62c1877

astro

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@astrojs/prism

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create-astro

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@astrojs/db

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@astrojs/internal-helpers

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@astrojs/lit

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@astrojs/markdoc

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@astrojs/mdx

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@astrojs/preact

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@astrojs/svelte

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@astrojs/web-vitals

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