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/sebastian/version/src/Version.php

@@ -0,0 +1,93 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/version.
+ *
+ * (c) Sebastian Bergmann <sebastian@phpunit.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann;
+
+use function end;
+use function explode;
+use function fclose;
+use function is_dir;
+use function is_resource;
+use function proc_close;
+use function proc_open;
+use function stream_get_contents;
+use function substr_count;
+use function trim;
+
+final class Version
+{
+    private readonly string $version;
+
+    public function __construct(string $release, string $path)
+    {
+        $this->version = $this->generate($release, $path);
+    }
+
+    public function asString(): string
+    {
+        return $this->version;
+    }
+
+    private function generate(string $release, string $path): string
+    {
+        if (substr_count($release, '.') + 1 === 3) {
+            $version = $release;
+        } else {
+            $version = $release . '-dev';
+        }
+
+        $git = $this->getGitInformation($path);
+
+        if (!$git) {
+            return $version;
+        }
+
+        if (substr_count($release, '.') + 1 === 3) {
+            return $git;
+        }
+
+        $git = explode('-', $git);
+
+        return $release . '-' . end($git);
+    }
+
+    private function getGitInformation(string $path): bool|string
+    {
+        if (!is_dir($path . DIRECTORY_SEPARATOR . '.git')) {
+            return false;
+        }
+
+        $process = proc_open(
+            'git describe --tags',
+            [
+                1 => ['pipe', 'w'],
+                2 => ['pipe', 'w'],
+            ],
+            $pipes,
+            $path
+        );
+
+        if (!is_resource($process)) {
+            return false;
+        }
+
+        $result = trim(stream_get_contents($pipes[1]));
+
+        fclose($pipes[1]);
+        fclose($pipes[2]);
+
+        $returnCode = proc_close($process);
+
+        if ($returnCode !== 0) {
+            return false;
+        }
+
+        return $result;
+    }
+}