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/console/CommandLoader/CommandLoaderInterface.php

@@ -0,0 +1,38 @@
+<?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\Console\CommandLoader;
+
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Exception\CommandNotFoundException;
+
+/**
+ * @author Robin Chalas <robin.chalas@gmail.com>
+ */
+interface CommandLoaderInterface
+{
+    /**
+     * Loads a command.
+     *
+     * @throws CommandNotFoundException
+     */
+    public function get(string $name): Command;
+
+    /**
+     * Checks if a command exists.
+     */
+    public function has(string $name): bool;
+
+    /**
+     * @return string[]
+     */
+    public function getNames(): array;
+}

docker/streamline-src/vendor/symfony/console/CommandLoader/ContainerCommandLoader.php

@@ -0,0 +1,55 @@
+<?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\Console\CommandLoader;
+
+use Psr\Container\ContainerInterface;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Exception\CommandNotFoundException;
+
+/**
+ * Loads commands from a PSR-11 container.
+ *
+ * @author Robin Chalas <robin.chalas@gmail.com>
+ */
+class ContainerCommandLoader implements CommandLoaderInterface
+{
+    private ContainerInterface $container;
+    private array $commandMap;
+
+    /**
+     * @param array $commandMap An array with command names as keys and service ids as values
+     */
+    public function __construct(ContainerInterface $container, array $commandMap)
+    {
+        $this->container = $container;
+        $this->commandMap = $commandMap;
+    }
+
+    public function get(string $name): Command
+    {
+        if (!$this->has($name)) {
+            throw new CommandNotFoundException(sprintf('Command "%s" does not exist.', $name));
+        }
+
+        return $this->container->get($this->commandMap[$name]);
+    }
+
+    public function has(string $name): bool
+    {
+        return isset($this->commandMap[$name]) && $this->container->has($this->commandMap[$name]);
+    }
+
+    public function getNames(): array
+    {
+        return array_keys($this->commandMap);
+    }
+}

docker/streamline-src/vendor/symfony/console/CommandLoader/FactoryCommandLoader.php

@@ -0,0 +1,54 @@
+<?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\Console\CommandLoader;
+
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Exception\CommandNotFoundException;
+
+/**
+ * A simple command loader using factories to instantiate commands lazily.
+ *
+ * @author Maxime Steinhausser <maxime.steinhausser@gmail.com>
+ */
+class FactoryCommandLoader implements CommandLoaderInterface
+{
+    private array $factories;
+
+    /**
+     * @param callable[] $factories Indexed by command names
+     */
+    public function __construct(array $factories)
+    {
+        $this->factories = $factories;
+    }
+
+    public function has(string $name): bool
+    {
+        return isset($this->factories[$name]);
+    }
+
+    public function get(string $name): Command
+    {
+        if (!isset($this->factories[$name])) {
+            throw new CommandNotFoundException(sprintf('Command "%s" does not exist.', $name));
+        }
+
+        $factory = $this->factories[$name];
+
+        return $factory();
+    }
+
+    public function getNames(): array
+    {
+        return array_keys($this->factories);
+    }
+}