Add deploy template support for serverless examples (FRONT-908)

[Copilot]

Enables one-click deployment to Railway and Vercel for serverless-capable examples. Cloudflare Workers examples excluded per requirements.

Changes

Infrastructure

• Added deployTemplate field to example metadata schema with railway and vercel options
• Extended build script to generate deployment metadata in registry

Examples Updated

• Railway (9): node, express, hono, hono-bun, elysia, deno, custom-serverless, trpc, drizzle
• Vercel (1): next-js

Website

• Conditional deploy buttons on template pages based on deployTemplate field
• DeployDropdown shows when quick-deploy options available

Documentation

• Example submission guide updated with deployTemplate usage
• Deployment sections added to key example READMEs with environment variables (RIVET_ENDPOINT, RIVET_NAMESPACE, RIVET_RUNNER_TOKEN)

Example

{
  "template": {
    "technologies": ["typescript", "hono"],
    "tags": ["starter"],
    "deployTemplate": {
      "railway": true
    }
  }
}

Generates deploy button on template page:

{template.deployTemplate?.railway && (
  <Link href={`https://railway.app/new/template?template=...`}>
    Deploy to Railway
  </Link>
)}

---

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[linear]

FRONT-908 Add deploy template for serverless examples

[vercel]

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Project	Deployment	Review	Updated (UTC)
rivet-site	Ready	Preview, Comment	Jan 5, 2026 5:44pm

3 Skipped Deployments

Project	Deployment	Review	Updated (UTC)
rivet-cloud	Ignored		Jan 5, 2026 5:44pm
rivet-inspector	Ignored	Preview	Jan 5, 2026 5:44pm
rivetkit-serverless	Skipped		Jan 5, 2026 5:44pm