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-foundation/Session/Flash/AutoExpireFlashBag.php

@@ -0,0 +1,137 @@
+<?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\HttpFoundation\Session\Flash;
+
+/**
+ * AutoExpireFlashBag flash message container.
+ *
+ * @author Drak <drak@zikula.org>
+ */
+class AutoExpireFlashBag implements FlashBagInterface
+{
+    private string $name = 'flashes';
+    private array $flashes = ['display' => [], 'new' => []];
+    private string $storageKey;
+
+    /**
+     * @param string $storageKey The key used to store flashes in the session
+     */
+    public function __construct(string $storageKey = '_symfony_flashes')
+    {
+        $this->storageKey = $storageKey;
+    }
+
+    public function getName(): string
+    {
+        return $this->name;
+    }
+
+    /**
+     * @return void
+     */
+    public function setName(string $name)
+    {
+        $this->name = $name;
+    }
+
+    /**
+     * @return void
+     */
+    public function initialize(array &$flashes)
+    {
+        $this->flashes = &$flashes;
+
+        // The logic: messages from the last request will be stored in new, so we move them to previous
+        // This request we will show what is in 'display'.  What is placed into 'new' this time round will
+        // be moved to display next time round.
+        $this->flashes['display'] = \array_key_exists('new', $this->flashes) ? $this->flashes['new'] : [];
+        $this->flashes['new'] = [];
+    }
+
+    /**
+     * @return void
+     */
+    public function add(string $type, mixed $message)
+    {
+        $this->flashes['new'][$type][] = $message;
+    }
+
+    public function peek(string $type, array $default = []): array
+    {
+        return $this->has($type) ? $this->flashes['display'][$type] : $default;
+    }
+
+    public function peekAll(): array
+    {
+        return \array_key_exists('display', $this->flashes) ? $this->flashes['display'] : [];
+    }
+
+    public function get(string $type, array $default = []): array
+    {
+        $return = $default;
+
+        if (!$this->has($type)) {
+            return $return;
+        }
+
+        if (isset($this->flashes['display'][$type])) {
+            $return = $this->flashes['display'][$type];
+            unset($this->flashes['display'][$type]);
+        }
+
+        return $return;
+    }
+
+    public function all(): array
+    {
+        $return = $this->flashes['display'];
+        $this->flashes['display'] = [];
+
+        return $return;
+    }
+
+    /**
+     * @return void
+     */
+    public function setAll(array $messages)
+    {
+        $this->flashes['new'] = $messages;
+    }
+
+    /**
+     * @return void
+     */
+    public function set(string $type, string|array $messages)
+    {
+        $this->flashes['new'][$type] = (array) $messages;
+    }
+
+    public function has(string $type): bool
+    {
+        return \array_key_exists($type, $this->flashes['display']) && $this->flashes['display'][$type];
+    }
+
+    public function keys(): array
+    {
+        return array_keys($this->flashes['display']);
+    }
+
+    public function getStorageKey(): string
+    {
+        return $this->storageKey;
+    }
+
+    public function clear(): mixed
+    {
+        return $this->all();
+    }
+}

docker/streamline-src/vendor/symfony/http-foundation/Session/Flash/FlashBag.php

@@ -0,0 +1,128 @@
+<?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\HttpFoundation\Session\Flash;
+
+/**
+ * FlashBag flash message container.
+ *
+ * @author Drak <drak@zikula.org>
+ */
+class FlashBag implements FlashBagInterface
+{
+    private string $name = 'flashes';
+    private array $flashes = [];
+    private string $storageKey;
+
+    /**
+     * @param string $storageKey The key used to store flashes in the session
+     */
+    public function __construct(string $storageKey = '_symfony_flashes')
+    {
+        $this->storageKey = $storageKey;
+    }
+
+    public function getName(): string
+    {
+        return $this->name;
+    }
+
+    /**
+     * @return void
+     */
+    public function setName(string $name)
+    {
+        $this->name = $name;
+    }
+
+    /**
+     * @return void
+     */
+    public function initialize(array &$flashes)
+    {
+        $this->flashes = &$flashes;
+    }
+
+    /**
+     * @return void
+     */
+    public function add(string $type, mixed $message)
+    {
+        $this->flashes[$type][] = $message;
+    }
+
+    public function peek(string $type, array $default = []): array
+    {
+        return $this->has($type) ? $this->flashes[$type] : $default;
+    }
+
+    public function peekAll(): array
+    {
+        return $this->flashes;
+    }
+
+    public function get(string $type, array $default = []): array
+    {
+        if (!$this->has($type)) {
+            return $default;
+        }
+
+        $return = $this->flashes[$type];
+
+        unset($this->flashes[$type]);
+
+        return $return;
+    }
+
+    public function all(): array
+    {
+        $return = $this->peekAll();
+        $this->flashes = [];
+
+        return $return;
+    }
+
+    /**
+     * @return void
+     */
+    public function set(string $type, string|array $messages)
+    {
+        $this->flashes[$type] = (array) $messages;
+    }
+
+    /**
+     * @return void
+     */
+    public function setAll(array $messages)
+    {
+        $this->flashes = $messages;
+    }
+
+    public function has(string $type): bool
+    {
+        return \array_key_exists($type, $this->flashes) && $this->flashes[$type];
+    }
+
+    public function keys(): array
+    {
+        return array_keys($this->flashes);
+    }
+
+    public function getStorageKey(): string
+    {
+        return $this->storageKey;
+    }
+
+    public function clear(): mixed
+    {
+        return $this->all();
+    }
+}

docker/streamline-src/vendor/symfony/http-foundation/Session/Flash/FlashBagInterface.php

@@ -0,0 +1,78 @@
+<?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\HttpFoundation\Session\Flash;
+
+use Symfony\Component\HttpFoundation\Session\SessionBagInterface;
+
+/**
+ * FlashBagInterface.
+ *
+ * @author Drak <drak@zikula.org>
+ */
+interface FlashBagInterface extends SessionBagInterface
+{
+    /**
+     * Adds a flash message for the given type.
+     *
+     * @return void
+     */
+    public function add(string $type, mixed $message);
+
+    /**
+     * Registers one or more messages for a given type.
+     *
+     * @return void
+     */
+    public function set(string $type, string|array $messages);
+
+    /**
+     * Gets flash messages for a given type.
+     *
+     * @param string $type    Message category type
+     * @param array  $default Default value if $type does not exist
+     */
+    public function peek(string $type, array $default = []): array;
+
+    /**
+     * Gets all flash messages.
+     */
+    public function peekAll(): array;
+
+    /**
+     * Gets and clears flash from the stack.
+     *
+     * @param array $default Default value if $type does not exist
+     */
+    public function get(string $type, array $default = []): array;
+
+    /**
+     * Gets and clears flashes from the stack.
+     */
+    public function all(): array;
+
+    /**
+     * Sets all flash messages.
+     *
+     * @return void
+     */
+    public function setAll(array $messages);
+
+    /**
+     * Has flash messages for a given type?
+     */
+    public function has(string $type): bool;
+
+    /**
+     * Returns a list of all defined types.
+     */
+    public function keys(): array;
+}