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/README.md

@@ -0,0 +1,40 @@
+Translation Component
+=====================
+
+The Translation component provides tools to internationalize your application.
+
+Getting Started
+---------------
+
+```
+$ composer require symfony/translation
+```
+
+```php
+use Symfony\Component\Translation\Translator;
+use Symfony\Component\Translation\Loader\ArrayLoader;
+
+$translator = new Translator('fr_FR');
+$translator->addLoader('array', new ArrayLoader());
+$translator->addResource('array', [
+    'Hello World!' => 'Bonjour !',
+], 'fr_FR');
+
+echo $translator->trans('Hello World!'); // outputs « Bonjour ! »
+```
+
+Sponsor
+-------
+
+Help Symfony by [sponsoring][1] its development!
+
+Resources
+---------
+
+ * [Documentation](https://symfony.com/doc/current/translation.html)
+ * [Contributing](https://symfony.com/doc/current/contributing/index.html)
+ * [Report issues](https://github.com/symfony/symfony/issues) and
+   [send Pull Requests](https://github.com/symfony/symfony/pulls)
+   in the [main Symfony repository](https://github.com/symfony/symfony)
+
+[1]: https://symfony.com/sponsor