Add npm publishing provenance

[emmatown]

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[changeset-bot]

🦋 Changeset detected

Latest commit: 6a6685f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 18 packages

Name	Type
@keystar/ui	Patch
@keystatic/astro	Patch
@keystatic/create	Patch
@keystatic/core	Patch
@keystatic/next	Patch
@keystatic/remix	Patch
@keystatic/templates-astro	Patch
@keystatic/templates-nextjs	Patch
@keystatic/templates-remix	Patch
@keystar/docs	Patch
@example/next-app	Patch
@example/next-pages	Patch
keystatic-docs	Patch
@example/astro-content	Patch
@example/astro	Patch
@example/localization	Patch
@example/next-block-builder	Patch
@keystatic/remix-test-app	Patch

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