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/var-dumper/Caster/ClassStub.php

@@ -0,0 +1,107 @@
+<?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\VarDumper\Caster;
+
+use Symfony\Component\VarDumper\Cloner\Stub;
+
+/**
+ * Represents a PHP class identifier.
+ *
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+class ClassStub extends ConstStub
+{
+    /**
+     * @param string   $identifier A PHP identifier, e.g. a class, method, interface, etc. name
+     * @param callable $callable   The callable targeted by the identifier when it is ambiguous or not a real PHP identifier
+     */
+    public function __construct(string $identifier, callable|array|string|null $callable = null)
+    {
+        $this->value = $identifier;
+
+        try {
+            if (null !== $callable) {
+                if ($callable instanceof \Closure) {
+                    $r = new \ReflectionFunction($callable);
+                } elseif (\is_object($callable)) {
+                    $r = [$callable, '__invoke'];
+                } elseif (\is_array($callable)) {
+                    $r = $callable;
+                } elseif (false !== $i = strpos($callable, '::')) {
+                    $r = [substr($callable, 0, $i), substr($callable, 2 + $i)];
+                } else {
+                    $r = new \ReflectionFunction($callable);
+                }
+            } elseif (0 < $i = strpos($identifier, '::') ?: strpos($identifier, '->')) {
+                $r = [substr($identifier, 0, $i), substr($identifier, 2 + $i)];
+            } else {
+                $r = new \ReflectionClass($identifier);
+            }
+
+            if (\is_array($r)) {
+                try {
+                    $r = new \ReflectionMethod($r[0], $r[1]);
+                } catch (\ReflectionException) {
+                    $r = new \ReflectionClass($r[0]);
+                }
+            }
+
+            if (str_contains($identifier, "@anonymous\0")) {
+                $this->value = $identifier = preg_replace_callback('/[a-zA-Z_\x7f-\xff][\\\\a-zA-Z0-9_\x7f-\xff]*+@anonymous\x00.*?\.php(?:0x?|:[0-9]++\$)[0-9a-fA-F]++/', fn ($m) => class_exists($m[0], false) ? (get_parent_class($m[0]) ?: key(class_implements($m[0])) ?: 'class').'@anonymous' : $m[0], $identifier);
+            }
+
+            if (null !== $callable && $r instanceof \ReflectionFunctionAbstract) {
+                $s = ReflectionCaster::castFunctionAbstract($r, [], new Stub(), true, Caster::EXCLUDE_VERBOSE);
+                $s = ReflectionCaster::getSignature($s);
+
+                if (str_ends_with($identifier, '()')) {
+                    $this->value = substr_replace($identifier, $s, -2);
+                } else {
+                    $this->value .= $s;
+                }
+            }
+        } catch (\ReflectionException) {
+            return;
+        } finally {
+            if (0 < $i = strrpos($this->value, '\\')) {
+                $this->attr['ellipsis'] = \strlen($this->value) - $i;
+                $this->attr['ellipsis-type'] = 'class';
+                $this->attr['ellipsis-tail'] = 1;
+            }
+        }
+
+        if ($f = $r->getFileName()) {
+            $this->attr['file'] = $f;
+            $this->attr['line'] = $r->getStartLine();
+        }
+    }
+
+    /**
+     * @return mixed
+     */
+    public static function wrapCallable(mixed $callable)
+    {
+        if (\is_object($callable) || !\is_callable($callable)) {
+            return $callable;
+        }
+
+        if (!\is_array($callable)) {
+            $callable = new static($callable, $callable);
+        } elseif (\is_string($callable[0])) {
+            $callable[0] = new static($callable[0], $callable);
+        } else {
+            $callable[1] = new static($callable[1], $callable);
+        }
+
+        return $callable;
+    }
+}