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/CacheClearer/CacheClearerInterface.php

@@ -0,0 +1,27 @@
+<?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\CacheClearer;
+
+/**
+ * CacheClearerInterface.
+ *
+ * @author Dustin Dobervich <ddobervich@gmail.com>
+ */
+interface CacheClearerInterface
+{
+    /**
+     * Clears any caches necessary.
+     *
+     * @return void
+     */
+    public function clear(string $cacheDir);
+}

docker/streamline-src/vendor/symfony/http-kernel/CacheClearer/ChainCacheClearer.php

@@ -0,0 +1,39 @@
+<?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\CacheClearer;
+
+/**
+ * ChainCacheClearer.
+ *
+ * @author Dustin Dobervich <ddobervich@gmail.com>
+ *
+ * @final
+ */
+class ChainCacheClearer implements CacheClearerInterface
+{
+    private iterable $clearers;
+
+    /**
+     * @param iterable<mixed, CacheClearerInterface> $clearers
+     */
+    public function __construct(iterable $clearers = [])
+    {
+        $this->clearers = $clearers;
+    }
+
+    public function clear(string $cacheDir): void
+    {
+        foreach ($this->clearers as $clearer) {
+            $clearer->clear($cacheDir);
+        }
+    }
+}

docker/streamline-src/vendor/symfony/http-kernel/CacheClearer/Psr6CacheClearer.php

@@ -0,0 +1,69 @@
+<?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\CacheClearer;
+
+use Psr\Cache\CacheItemPoolInterface;
+
+/**
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+class Psr6CacheClearer implements CacheClearerInterface
+{
+    private array $pools = [];
+
+    /**
+     * @param array<string, CacheItemPoolInterface> $pools
+     */
+    public function __construct(array $pools = [])
+    {
+        $this->pools = $pools;
+    }
+
+    public function hasPool(string $name): bool
+    {
+        return isset($this->pools[$name]);
+    }
+
+    /**
+     * @throws \InvalidArgumentException If the cache pool with the given name does not exist
+     */
+    public function getPool(string $name): CacheItemPoolInterface
+    {
+        if (!$this->hasPool($name)) {
+            throw new \InvalidArgumentException(sprintf('Cache pool not found: "%s".', $name));
+        }
+
+        return $this->pools[$name];
+    }
+
+    /**
+     * @throws \InvalidArgumentException If the cache pool with the given name does not exist
+     */
+    public function clearPool(string $name): bool
+    {
+        if (!isset($this->pools[$name])) {
+            throw new \InvalidArgumentException(sprintf('Cache pool not found: "%s".', $name));
+        }
+
+        return $this->pools[$name]->clear();
+    }
+
+    /**
+     * @return void
+     */
+    public function clear(string $cacheDir)
+    {
+        foreach ($this->pools as $pool) {
+            $pool->clear();
+        }
+    }
+}