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/auth-backend/RegistersUsers.php

@@ -0,0 +1,68 @@
+<?php
+
+namespace Illuminate\Foundation\Auth;
+
+use Illuminate\Auth\Events\Registered;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Auth;
+
+trait RegistersUsers
+{
+    use RedirectsUsers;
+
+    /**
+     * Show the application registration form.
+     *
+     * @return \Illuminate\View\View
+     */
+    public function showRegistrationForm()
+    {
+        return view('auth.register');
+    }
+
+    /**
+     * Handle a registration request for the application.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @return \Illuminate\Http\RedirectResponse|\Illuminate\Http\JsonResponse
+     */
+    public function register(Request $request)
+    {
+        $this->validator($request->all())->validate();
+
+        event(new Registered($user = $this->create($request->all())));
+
+        $this->guard()->login($user);
+
+        if ($response = $this->registered($request, $user)) {
+            return $response;
+        }
+
+        return $request->wantsJson()
+                    ? new JsonResponse([], 201)
+                    : redirect($this->redirectPath());
+    }
+
+    /**
+     * Get the guard to be used during registration.
+     *
+     * @return \Illuminate\Contracts\Auth\StatefulGuard
+     */
+    protected function guard()
+    {
+        return Auth::guard();
+    }
+
+    /**
+     * The user has been registered.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @param  mixed  $user
+     * @return mixed
+     */
+    protected function registered(Request $request, $user)
+    {
+        //
+    }
+}