Build modified streamline images

The official image from streamline does not currently work for the arm64
platform. As a temporary measure, the source code and docker build scripts
have been lifted from the official images and are used to build locally.

Some additional modifications are made to reduce overall image size, these
are documented in docker/README.md

docker/streamline-src/tests/DuskTestCase.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace Tests;
+
+use Laravel\Dusk\TestCase as BaseTestCase;
+use Facebook\WebDriver\Chrome\ChromeOptions;
+use Facebook\WebDriver\Remote\RemoteWebDriver;
+use Facebook\WebDriver\Remote\DesiredCapabilities;
+
+abstract class DuskTestCase extends BaseTestCase
+{
+    use CreatesApplication;
+
+    /**
+     * Prepare for Dusk test execution.
+     *
+     * @beforeClass
+     * @return void
+     */
+    public static function prepare()
+    {
+        static::startChromeDriver();
+    }
+
+    /**
+     * Create the RemoteWebDriver instance.
+     *
+     * @return \Facebook\WebDriver\Remote\RemoteWebDriver
+     */
+    protected function driver()
+    {
+        $options = (new ChromeOptions)->addArguments([
+            '--disable-gpu',
+            '--headless'
+        ]);
+
+        return RemoteWebDriver::create(
+            'http://localhost:9515', DesiredCapabilities::chrome()->setCapability(
+                ChromeOptions::CAPABILITY, $options
+            )
+        );
+    }
+}