docs: update development server ports and enhance Railpack documentation

- Changed development server ports for both the docs and website applications to avoid conflicts.
- Expanded the Railpack documentation to include a section on specifying the Railpack version, detailing how to pin, upgrade, or maintain stable versions for consistent builds.
- Added a callout for invalid version specifications to improve user guidance.

apps/docs/content/docs/core/applications/build-type.mdx

@@ -56,7 +56,30 @@ Railpack exposes multiple Build Variables, you can define them in the `Environme
 | `RAILPACK_BUILD_APT_PACKAGES`  | Install additional Apt packages during build                                                               |
 | `RAILPACK_DEPLOY_APT_PACKAGES` | Install additional Apt packages in the final image                                                         |
 
-you can read more about Railpack [here](https://railpack.com/config/environment-variables).
+### Specifying Railpack Version
+
+Dokploy provides a **Railpack Version** field in the application settings where you can specify a specific version of Railpack to use. This allows you to:
+
+- **Pin to a specific version**: Ensure consistent builds across deployments
+- **Use a newer version**: Test or use features from a specific release
+- **Stay on a stable version**: Avoid potential issues from automatic updates
+
+**How to use:**
+
+1. Navigate to your application settings
+2. Find the **Railpack Version** field
+3. Enter the version you want to use (e.g., `0.15.1`)
+4. Dokploy will automatically download and use the specified version for your builds
+
+**Example:**
+
+To use Railpack version `0.15.1`, simply enter `0.15.1` in the Railpack Version field.
+
+<Callout type="warn">
+  If you specify an invalid version, Dokploy will show an error. Make sure to use a valid version from the [Railpack releases page](https://github.com/railwayapp/railpack/releases).
+</Callout>
+
+You can read more about Railpack [here](https://railpack.com/config/environment-variables).
 
 Railpack supports Nodejs, Python, Go, PHP, Go, StaticFile, Shell Scripts.
 

apps/docs/package.json

@@ -4,7 +4,7 @@
 	"private": true,
 	"scripts": {
 		"build": "next build",
-		"dev": "next dev",
+		"dev": "next dev --port 3002",
 		"start": "next start",
 		"types:check": "fumadocs-mdx && tsc --noEmit",
 		"postinstall": "fumadocs-mdx",

apps/website/package.json

@@ -4,7 +4,7 @@
 	"version": "0.1.0",
 	"private": true,
 	"scripts": {
-		"dev": "next dev",
+		"dev": "next dev --port 3001",
 		"build": "next build",
 		"start": "next start",
 		"lint": "next lint",