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/translation/Exception/UnsupportedSchemeException.php

@@ -0,0 +1,58 @@
+<?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\Translation\Exception;
+
+use Symfony\Component\Translation\Bridge;
+use Symfony\Component\Translation\Provider\Dsn;
+
+class UnsupportedSchemeException extends LogicException
+{
+    private const SCHEME_TO_PACKAGE_MAP = [
+        'crowdin' => [
+            'class' => Bridge\Crowdin\CrowdinProviderFactory::class,
+            'package' => 'symfony/crowdin-translation-provider',
+        ],
+        'loco' => [
+            'class' => Bridge\Loco\LocoProviderFactory::class,
+            'package' => 'symfony/loco-translation-provider',
+        ],
+        'lokalise' => [
+            'class' => Bridge\Lokalise\LokaliseProviderFactory::class,
+            'package' => 'symfony/lokalise-translation-provider',
+        ],
+        'phrase' => [
+            'class' => Bridge\Phrase\PhraseProviderFactory::class,
+            'package' => 'symfony/phrase-translation-provider',
+        ],
+    ];
+
+    public function __construct(Dsn $dsn, ?string $name = null, array $supported = [])
+    {
+        $provider = $dsn->getScheme();
+        if (false !== $pos = strpos($provider, '+')) {
+            $provider = substr($provider, 0, $pos);
+        }
+        $package = self::SCHEME_TO_PACKAGE_MAP[$provider] ?? null;
+        if ($package && !class_exists($package['class'])) {
+            parent::__construct(sprintf('Unable to synchronize translations via "%s" as the provider is not installed. Try running "composer require %s".', $provider, $package['package']));
+
+            return;
+        }
+
+        $message = sprintf('The "%s" scheme is not supported', $dsn->getScheme());
+        if ($name && $supported) {
+            $message .= sprintf('; supported schemes for translation provider "%s" are: "%s"', $name, implode('", "', $supported));
+        }
+
+        parent::__construct($message.'.');
+    }
+}