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/vendor/laravel/ui/tests/AuthBackend/ThrottleLoginsTest.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace Laravel\Ui\Tests\AuthBackend;
+
+use Illuminate\Foundation\Auth\ThrottlesLogins;
+use Orchestra\Testbench\TestCase;
+use Illuminate\Http\Request;
+use PHPUnit\Framework\MockObject\MockObject;
+
+class ThrottleLoginsTest extends TestCase
+{
+    /**
+     * @test
+     * @dataProvider emailProvider
+     */
+    public function it_can_generate_throttle_key(string $email, string $expectedEmail): void
+    {
+        $throttle = $this->getMockForTrait(ThrottlesLogins::class, [], '', true, true, true, ['username']);
+        $throttle->method('username')->willReturn('email');
+        $reflection = new \ReflectionClass($throttle);
+        $method = $reflection->getMethod('throttleKey');
+        $method->setAccessible(true);
+
+        $request = $this->mock(Request::class);
+        $request->expects('input')->with('email')->andReturn($email);
+        $request->expects('ip')->andReturn('192.168.0.1');
+
+        $this->assertSame($expectedEmail . '|192.168.0.1', $method->invoke($throttle, $request));
+    }
+
+    public static function emailProvider(): array
+    {
+        return [
+            'lowercase special characters' => ['ⓣⓔⓢⓣ@ⓛⓐⓡⓐⓥⓔⓛ.ⓒⓞⓜ', 'test@laravel.com'],
+            'uppercase special characters' => ['ⓉⒺⓈⓉ@ⓁⒶⓇⒶⓋⒺⓁ.ⒸⓄⓂ', 'test@laravel.com'],
+            'special character numbers' =>['test⑩⓸③@laravel.com', 'test1043@laravel.com'],
+            'default email' => ['test@laravel.com', 'test@laravel.com'],
+        ];
+    }
+}