fix: use correct content type for json manifests

[igboyes]

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	virtool-ca	dc51391	Commit Preview URL Branch Preview URL	May 05 2026, 09:20 PM

[gemini-code-assist]

Code Review

This pull request adds .codex to the .gitignore file, introduces the sharp dependency, and updates the release endpoints to explicitly set the Content-Type header for JSON responses. A review comment suggests using the more idiomatic Response.json() method to simplify the response logic and automatically handle headers.

[gemini-code-assist]

Using Response.json() is a more concise and idiomatic way to return JSON responses in modern JavaScript environments (Node.js 16.8+, Cloudflare Workers, etc.). It automatically handles the stringification of the data and sets the Content-Type header to application/json.

returnResponse.json(data);