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/UnableToDeleteFile.php

@@ -0,0 +1,45 @@
+<?php
+
+declare(strict_types=1);
+
+namespace League\Flysystem;
+
+use RuntimeException;
+use Throwable;
+
+final class UnableToDeleteFile extends RuntimeException implements FilesystemOperationFailed
+{
+    /**
+     * @var string
+     */
+    private $location = '';
+
+    /**
+     * @var string
+     */
+    private $reason;
+
+    public static function atLocation(string $location, string $reason = '', Throwable $previous = null): UnableToDeleteFile
+    {
+        $e = new static(rtrim("Unable to delete file located at: {$location}. {$reason}"), 0, $previous);
+        $e->location = $location;
+        $e->reason = $reason;
+
+        return $e;
+    }
+
+    public function operation(): string
+    {
+        return FilesystemOperationFailed::OPERATION_DELETE;
+    }
+
+    public function reason(): string
+    {
+        return $this->reason;
+    }
+
+    public function location(): string
+    {
+        return $this->location;
+    }
+}