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/symfony/http-kernel/HttpKernel.php

@@ -0,0 +1,319 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpKernel;
+
+use Symfony\Component\HttpFoundation\Exception\RequestExceptionInterface;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\RequestStack;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpFoundation\StreamedResponse;
+use Symfony\Component\HttpKernel\Controller\ArgumentResolver;
+use Symfony\Component\HttpKernel\Controller\ArgumentResolverInterface;
+use Symfony\Component\HttpKernel\Controller\ControllerResolverInterface;
+use Symfony\Component\HttpKernel\Event\ControllerArgumentsEvent;
+use Symfony\Component\HttpKernel\Event\ControllerEvent;
+use Symfony\Component\HttpKernel\Event\ExceptionEvent;
+use Symfony\Component\HttpKernel\Event\FinishRequestEvent;
+use Symfony\Component\HttpKernel\Event\RequestEvent;
+use Symfony\Component\HttpKernel\Event\ResponseEvent;
+use Symfony\Component\HttpKernel\Event\TerminateEvent;
+use Symfony\Component\HttpKernel\Event\ViewEvent;
+use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
+use Symfony\Component\HttpKernel\Exception\ControllerDoesNotReturnResponseException;
+use Symfony\Component\HttpKernel\Exception\HttpExceptionInterface;
+use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
+
+// Help opcache.preload discover always-needed symbols
+class_exists(ControllerArgumentsEvent::class);
+class_exists(ControllerEvent::class);
+class_exists(ExceptionEvent::class);
+class_exists(FinishRequestEvent::class);
+class_exists(RequestEvent::class);
+class_exists(ResponseEvent::class);
+class_exists(TerminateEvent::class);
+class_exists(ViewEvent::class);
+class_exists(KernelEvents::class);
+
+/**
+ * HttpKernel notifies events to convert a Request object to a Response one.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class HttpKernel implements HttpKernelInterface, TerminableInterface
+{
+    protected $dispatcher;
+    protected $resolver;
+    protected $requestStack;
+    private ArgumentResolverInterface $argumentResolver;
+    private bool $handleAllThrowables;
+
+    public function __construct(EventDispatcherInterface $dispatcher, ControllerResolverInterface $resolver, ?RequestStack $requestStack = null, ?ArgumentResolverInterface $argumentResolver = null, bool $handleAllThrowables = false)
+    {
+        $this->dispatcher = $dispatcher;
+        $this->resolver = $resolver;
+        $this->requestStack = $requestStack ?? new RequestStack();
+        $this->argumentResolver = $argumentResolver ?? new ArgumentResolver();
+        $this->handleAllThrowables = $handleAllThrowables;
+    }
+
+    public function handle(Request $request, int $type = HttpKernelInterface::MAIN_REQUEST, bool $catch = true): Response
+    {
+        $request->headers->set('X-Php-Ob-Level', (string) ob_get_level());
+
+        $this->requestStack->push($request);
+        $response = null;
+        try {
+            return $response = $this->handleRaw($request, $type);
+        } catch (\Throwable $e) {
+            if ($e instanceof \Error && !$this->handleAllThrowables) {
+                throw $e;
+            }
+
+            if ($e instanceof RequestExceptionInterface) {
+                $e = new BadRequestHttpException($e->getMessage(), $e);
+            }
+            if (false === $catch) {
+                $this->finishRequest($request, $type);
+
+                throw $e;
+            }
+
+            return $response = $this->handleThrowable($e, $request, $type);
+        } finally {
+            $this->requestStack->pop();
+
+            if ($response instanceof StreamedResponse && $callback = $response->getCallback()) {
+                $requestStack = $this->requestStack;
+
+                $response->setCallback(static function () use ($request, $callback, $requestStack) {
+                    $requestStack->push($request);
+                    try {
+                        $callback();
+                    } finally {
+                        $requestStack->pop();
+                    }
+                });
+            }
+        }
+    }
+
+    /**
+     * @return void
+     */
+    public function terminate(Request $request, Response $response)
+    {
+        $this->dispatcher->dispatch(new TerminateEvent($this, $request, $response), KernelEvents::TERMINATE);
+    }
+
+    /**
+     * @internal
+     */
+    public function terminateWithException(\Throwable $exception, ?Request $request = null): void
+    {
+        if (!$request ??= $this->requestStack->getMainRequest()) {
+            throw $exception;
+        }
+
+        if ($pop = $request !== $this->requestStack->getMainRequest()) {
+            $this->requestStack->push($request);
+        }
+
+        try {
+            $response = $this->handleThrowable($exception, $request, self::MAIN_REQUEST);
+        } finally {
+            if ($pop) {
+                $this->requestStack->pop();
+            }
+        }
+
+        $response->sendHeaders();
+        $response->sendContent();
+
+        $this->terminate($request, $response);
+    }
+
+    /**
+     * Handles a request to convert it to a response.
+     *
+     * Exceptions are not caught.
+     *
+     * @throws \LogicException       If one of the listener does not behave as expected
+     * @throws NotFoundHttpException When controller cannot be found
+     */
+    private function handleRaw(Request $request, int $type = self::MAIN_REQUEST): Response
+    {
+        // request
+        $event = new RequestEvent($this, $request, $type);
+        $this->dispatcher->dispatch($event, KernelEvents::REQUEST);
+
+        if ($event->hasResponse()) {
+            return $this->filterResponse($event->getResponse(), $request, $type);
+        }
+
+        // load controller
+        if (false === $controller = $this->resolver->getController($request)) {
+            throw new NotFoundHttpException(sprintf('Unable to find the controller for path "%s". The route is wrongly configured.', $request->getPathInfo()));
+        }
+
+        $event = new ControllerEvent($this, $controller, $request, $type);
+        $this->dispatcher->dispatch($event, KernelEvents::CONTROLLER);
+        $controller = $event->getController();
+
+        // controller arguments
+        $arguments = $this->argumentResolver->getArguments($request, $controller, $event->getControllerReflector());
+
+        $event = new ControllerArgumentsEvent($this, $event, $arguments, $request, $type);
+        $this->dispatcher->dispatch($event, KernelEvents::CONTROLLER_ARGUMENTS);
+        $controller = $event->getController();
+        $arguments = $event->getArguments();
+
+        // call controller
+        $response = $controller(...$arguments);
+
+        // view
+        if (!$response instanceof Response) {
+            $event = new ViewEvent($this, $request, $type, $response, $event);
+            $this->dispatcher->dispatch($event, KernelEvents::VIEW);
+
+            if ($event->hasResponse()) {
+                $response = $event->getResponse();
+            } else {
+                $msg = sprintf('The controller must return a "Symfony\Component\HttpFoundation\Response" object but it returned %s.', $this->varToString($response));
+
+                // the user may have forgotten to return something
+                if (null === $response) {
+                    $msg .= ' Did you forget to add a return statement somewhere in your controller?';
+                }
+
+                throw new ControllerDoesNotReturnResponseException($msg, $controller, __FILE__, __LINE__ - 17);
+            }
+        }
+
+        return $this->filterResponse($response, $request, $type);
+    }
+
+    /**
+     * Filters a response object.
+     *
+     * @throws \RuntimeException if the passed object is not a Response instance
+     */
+    private function filterResponse(Response $response, Request $request, int $type): Response
+    {
+        $event = new ResponseEvent($this, $request, $type, $response);
+
+        $this->dispatcher->dispatch($event, KernelEvents::RESPONSE);
+
+        $this->finishRequest($request, $type);
+
+        return $event->getResponse();
+    }
+
+    /**
+     * Publishes the finish request event, then pop the request from the stack.
+     *
+     * Note that the order of the operations is important here, otherwise
+     * operations such as {@link RequestStack::getParentRequest()} can lead to
+     * weird results.
+     */
+    private function finishRequest(Request $request, int $type): void
+    {
+        $this->dispatcher->dispatch(new FinishRequestEvent($this, $request, $type), KernelEvents::FINISH_REQUEST);
+    }
+
+    /**
+     * Handles a throwable by trying to convert it to a Response.
+     */
+    private function handleThrowable(\Throwable $e, Request $request, int $type): Response
+    {
+        $event = new ExceptionEvent($this, $request, $type, $e);
+        $this->dispatcher->dispatch($event, KernelEvents::EXCEPTION);
+
+        // a listener might have replaced the exception
+        $e = $event->getThrowable();
+
+        if (!$event->hasResponse()) {
+            $this->finishRequest($request, $type);
+
+            throw $e;
+        }
+
+        $response = $event->getResponse();
+
+        // the developer asked for a specific status code
+        if (!$event->isAllowingCustomResponseCode() && !$response->isClientError() && !$response->isServerError() && !$response->isRedirect()) {
+            // ensure that we actually have an error response
+            if ($e instanceof HttpExceptionInterface) {
+                // keep the HTTP status code and headers
+                $response->setStatusCode($e->getStatusCode());
+                $response->headers->add($e->getHeaders());
+            } else {
+                $response->setStatusCode(500);
+            }
+        }
+
+        try {
+            return $this->filterResponse($response, $request, $type);
+        } catch (\Throwable $e) {
+            if ($e instanceof \Error && !$this->handleAllThrowables) {
+                throw $e;
+            }
+
+            return $response;
+        }
+    }
+
+    /**
+     * Returns a human-readable string for the specified variable.
+     */
+    private function varToString(mixed $var): string
+    {
+        if (\is_object($var)) {
+            return sprintf('an object of type %s', $var::class);
+        }
+
+        if (\is_array($var)) {
+            $a = [];
+            foreach ($var as $k => $v) {
+                $a[] = sprintf('%s => ...', $k);
+            }
+
+            return sprintf('an array ([%s])', mb_substr(implode(', ', $a), 0, 255));
+        }
+
+        if (\is_resource($var)) {
+            return sprintf('a resource (%s)', get_resource_type($var));
+        }
+
+        if (null === $var) {
+            return 'null';
+        }
+
+        if (false === $var) {
+            return 'a boolean value (false)';
+        }
+
+        if (true === $var) {
+            return 'a boolean value (true)';
+        }
+
+        if (\is_string($var)) {
+            return sprintf('a string ("%s%s")', mb_substr($var, 0, 255), mb_strlen($var) > 255 ? '...' : '');
+        }
+
+        if (is_numeric($var)) {
+            return sprintf('a number (%s)', (string) $var);
+        }
+
+        return (string) $var;
+    }
+}