Add Nightwatch health check script (#572)

* Add Nightwatch health check script

* Add documentation for Laravel Nightwatch

---------

Co-authored-by: Jay Rogers <3174134+jaydrogers@users.noreply.github.com>
Co-authored-by: Jay Rogers <jaydrogers@users.noreply.serversideup.net>

Author: arnaud-ritti

docs/content/docs/3.framework-guides/1.laravel/5.nightwatch.md

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+---
+head.title: 'Laravel Nightwatch with Docker - Docker PHP - Server Side Up'
+description: 'Learn how to configure Laravel Nightwatch with Docker.'
+layout: docs
+title: Nightwatch
+---
+
+## Laravel Nightwatch with Docker
+Run Laravel Nightwatch by passing the Artisan command as the container's command. Nightwatch is Laravel's observability platform for monitoring application performance, errors, and queries in real-time.
+
+::note
+Before using Nightwatch with Docker, follow the [Laravel Nightwatch setup instructions](https://nightwatch.laravel.com/docs/start-guide) to install and configure the Nightwatch package in your Laravel application.
+::
+
+## Docker Compose example
+
+This example runs Nightwatch as a separate container using the same image as your web service.
+
+**Key points:**
+- Use the same image for both your web and Nightwatch services
+- Set `SIGTERM` as the stop signal for graceful shutdown (especially for `fpm-apache` and `fpm-nginx`)
+- Include a health check to monitor Nightwatch status
+
+```yml [compose.yml]
+services:
+  php:
+    image: my/laravel-app
+
+  nightwatch:
+    image: my/laravel-app
+    command: ["php", "/var/www/html/artisan", "nightwatch:agent"]
+    stop_signal: SIGTERM
+    healthcheck:
+      test: ["CMD", "healthcheck-nightwatch"]
+      start_period: 10s
+```
+
+## How the health check works
+
+The `healthcheck-nightwatch` command runs `php artisan nightwatch:status` to verify that the Nightwatch agent is running and connected. Docker uses this to determine container health and can automatically restart unhealthy containers.
+
+## Advanced configuration
+
+**Graceful shutdown:** The `SIGTERM` signal ensures the Nightwatch agent finishes processing current events before stopping. This is especially important for `fpm-apache` and `fpm-nginx` images.
+
+::tip
+**Multiple processes in one container:** If you're running `fpm-nginx` or `fpm-apache` and you'd like to have everything in a single container, you can [write your own S6 Overlay service script](https://github.com/just-containers/s6-overlay/tree/master#writing-a-service-script){target="_blank"} to properly manage multiple processes in a single container. Learn more about about this in our [Using S6 Overlay guide](/docs/guide/using-s6-overlay).
+::
+
+## Learn More
+- [Laravel Nightwatch Documentation](https://nightwatch.laravel.com/docs/start-guide)

src/common/usr/local/bin/healthcheck-nightwatch

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+#!/bin/sh
+php "${APP_BASE_DIR}/artisan" nightwatch:status