Add railway section to the docs (#4904)

# Description of Changes

Add documentation for how to deploy on Railway under "Hosting" in the
docs


https://github.com/user-attachments/assets/b36a7f53-e0db-4fa3-8b0e-65930c71b3a8

# API and ABI breaking changes

<!-- If this is an API or ABI breaking change, please apply the
corresponding GitHub label. -->

# Expected complexity level and risk

1 - just a docs change

# Testing

Ran the docs locally and verified the page looked good and that the
content is correct. See video above.

docs/docs/00300-resources/00000-index.md

@@ -12,6 +12,7 @@ Step-by-step guides for common tasks.
 
 - **Deployment**
   - [Deploy to MainCloud](./00100-how-to/00100-deploy/00100-maincloud.md) - Deploy to SpacetimeDB's managed cloud
+  - [Railway](./00100-how-to/00100-deploy/00300-railway.md) - Deploy SpacetimeDB with the official Railway template
   - [Self-Hosting](./00100-how-to/00100-deploy/00200-self-hosting.md) - Run SpacetimeDB on your own infrastructure
 
 - **Database Features**

docs/docs/00300-resources/00100-how-to/00100-deploy/00300-railway.md

@@ -0,0 +1,71 @@
+---
+title: Railway
+slug: /how-to/deploy/railway
+---
+
+Railway is a hosted platform for deploying infrastructure and application services. If you want to run SpacetimeDB without managing your own VM, the official Railway template is a quick way to get started.
+
+The template deploys the first-party `clockworklabs/spacetime` image, exposes port `3000`, and provisions persistent storage at `/stdb`. Once the service is running, you can publish one or more databases to it with the SpacetimeDB CLI.
+
+## Prerequisites
+
+1. A [Railway account](https://railway.com/)
+2. The SpacetimeDB CLI installed: [Install SpacetimeDB](https://spacetimedb.com/install)
+3. A SpacetimeDB module project ready to publish
+
+## Step 1: Deploy the Railway template
+
+Open the official deployment template:
+
+[SpacetimeDB Template](https://railway.com/deploy/spacetimedb)
+
+Then:
+
+1. Click **Deploy Now**.
+2. Create a new Railway project or choose an existing one.
+3. Wait for the deployment to finish.
+4. In Railway, open your service and copy its public domain or attach a custom domain.
+
+That domain is the base URL your CLI and clients will use to connect to this SpacetimeDB instance.
+
+## Step 2: Add the Railway deployment to your CLI
+
+Register your Railway deployment as a named server:
+
+```bash
+spacetime server add --url https://<your-railway-domain> railway
+```
+
+For example:
+
+```bash
+spacetime server add --url https://my-railway-app.up.railway.app railway
+```
+
+You can optionally verify the connection:
+
+```bash
+spacetime server ping railway
+```
+
+## Step 3: Publish your database
+
+From your SpacetimeDB project, publish a database to the Railway deployment:
+
+```bash
+spacetime publish my-database --server railway
+```
+
+To update an existing database later, run the same command again.
+
+## Step 4: Connect clients
+
+After publishing, connect your client to your Railway-hosted database using your Railway domain as the server URI and your database name.
+
+See [Connecting to SpacetimeDB](../../../00200-core-concepts/00600-clients/00300-connection.md) for the current client connection patterns across supported SDKs.
+
+## Notes
+
+- The Railway template sets up the SpacetimeDB server itself, but it does not publish your module for you. You still deploy your database schema and logic with `spacetime publish`.
+- A single Railway-hosted SpacetimeDB instance can host multiple databases.
+- If you want full control over the host, reverse proxy, and operating system setup, see [Self-hosting](./00200-self-hosting.md).