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/league/flysystem/src/DirectoryAttributes.php

@@ -0,0 +1,87 @@
+<?php
+
+declare(strict_types=1);
+
+namespace League\Flysystem;
+
+class DirectoryAttributes implements StorageAttributes
+{
+    use ProxyArrayAccessToProperties;
+    private string $type = StorageAttributes::TYPE_DIRECTORY;
+
+    public function __construct(
+        private string $path,
+        private ?string $visibility = null,
+        private ?int $lastModified = null,
+        private array $extraMetadata = []
+    ) {
+        $this->path = trim($this->path, '/');
+    }
+
+    public function path(): string
+    {
+        return $this->path;
+    }
+
+    public function type(): string
+    {
+        return $this->type;
+    }
+
+    public function visibility(): ?string
+    {
+        return $this->visibility;
+    }
+
+    public function lastModified(): ?int
+    {
+        return $this->lastModified;
+    }
+
+    public function extraMetadata(): array
+    {
+        return $this->extraMetadata;
+    }
+
+    public function isFile(): bool
+    {
+        return false;
+    }
+
+    public function isDir(): bool
+    {
+        return true;
+    }
+
+    public function withPath(string $path): self
+    {
+        $clone = clone $this;
+        $clone->path = $path;
+
+        return $clone;
+    }
+
+    public static function fromArray(array $attributes): self
+    {
+        return new DirectoryAttributes(
+            $attributes[StorageAttributes::ATTRIBUTE_PATH],
+            $attributes[StorageAttributes::ATTRIBUTE_VISIBILITY] ?? null,
+            $attributes[StorageAttributes::ATTRIBUTE_LAST_MODIFIED] ?? null,
+            $attributes[StorageAttributes::ATTRIBUTE_EXTRA_METADATA] ?? []
+        );
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function jsonSerialize(): array
+    {
+        return [
+            StorageAttributes::ATTRIBUTE_TYPE => $this->type,
+            StorageAttributes::ATTRIBUTE_PATH => $this->path,
+            StorageAttributes::ATTRIBUTE_VISIBILITY => $this->visibility,
+            StorageAttributes::ATTRIBUTE_LAST_MODIFIED => $this->lastModified,
+            StorageAttributes::ATTRIBUTE_EXTRA_METADATA => $this->extraMetadata,
+        ];
+    }
+}