build script - add a new sourceFile item to frontmatter

[NWylynko]

🔎 Previews:

• https://clerk-git-nick-fix-open-in-github.clerkstage.dev/docs/pr/nick-add-source-file-to-frontmatter

What does this solve?

• With the addition of distinct variants guides (where a guide is for a specific sdk, filename ends in .ios.mdx, .react.mdx, etc) the edit in github link has broken as it always points to the core guide.

What changed?

• Updated the build script to embed the sourceFile in the frontmatter, defining where in the github repo you can find the guide.

Reference
https://clerkinc.slack.com/archives/C01QFRQNHSN/p1760736408984219

Sibling pr
https://github.com/clerk/clerk/pull/1725

Checklist

• I have clicked on "Files changed" and performed a thorough self-review
• All existing checks pass

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[manovotny]

I'd like to understand more. Is a new field even necessary? Wouldn't import.meta.url give us what we want, either here or in the docs file itself?

[NWylynko]

@manovotny Sorry I'm not sure I follow, import.meta.url is for getting info on the js modules that its used in.

Disregard. The test files were throwing me off with explicitly defining the path. I was thinking we'd have to add that to all docs, but we won't.