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/guzzlehttp/psr7/src/FnStream.php

@@ -0,0 +1,180 @@
+<?php
+
+declare(strict_types=1);
+
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Compose stream implementations based on a hash of functions.
+ *
+ * Allows for easy testing and extension of a provided stream without needing
+ * to create a concrete class for a simple extension point.
+ */
+#[\AllowDynamicProperties]
+final class FnStream implements StreamInterface
+{
+    private const SLOTS = [
+        '__toString', 'close', 'detach', 'rewind',
+        'getSize', 'tell', 'eof', 'isSeekable', 'seek', 'isWritable', 'write',
+        'isReadable', 'read', 'getContents', 'getMetadata',
+    ];
+
+    /** @var array<string, callable> */
+    private $methods;
+
+    /**
+     * @param array<string, callable> $methods Hash of method name to a callable.
+     */
+    public function __construct(array $methods)
+    {
+        $this->methods = $methods;
+
+        // Create the functions on the class
+        foreach ($methods as $name => $fn) {
+            $this->{'_fn_'.$name} = $fn;
+        }
+    }
+
+    /**
+     * Lazily determine which methods are not implemented.
+     *
+     * @throws \BadMethodCallException
+     */
+    public function __get(string $name): void
+    {
+        throw new \BadMethodCallException(str_replace('_fn_', '', $name)
+            .'() is not implemented in the FnStream');
+    }
+
+    /**
+     * The close method is called on the underlying stream only if possible.
+     */
+    public function __destruct()
+    {
+        if (isset($this->_fn_close)) {
+            ($this->_fn_close)();
+        }
+    }
+
+    /**
+     * An unserialize would allow the __destruct to run when the unserialized value goes out of scope.
+     *
+     * @throws \LogicException
+     */
+    public function __wakeup(): void
+    {
+        throw new \LogicException('FnStream should never be unserialized');
+    }
+
+    /**
+     * Adds custom functionality to an underlying stream by intercepting
+     * specific method calls.
+     *
+     * @param StreamInterface         $stream  Stream to decorate
+     * @param array<string, callable> $methods Hash of method name to a closure
+     *
+     * @return FnStream
+     */
+    public static function decorate(StreamInterface $stream, array $methods)
+    {
+        // If any of the required methods were not provided, then simply
+        // proxy to the decorated stream.
+        foreach (array_diff(self::SLOTS, array_keys($methods)) as $diff) {
+            /** @var callable $callable */
+            $callable = [$stream, $diff];
+            $methods[$diff] = $callable;
+        }
+
+        return new self($methods);
+    }
+
+    public function __toString(): string
+    {
+        try {
+            /** @var string */
+            return ($this->_fn___toString)();
+        } catch (\Throwable $e) {
+            if (\PHP_VERSION_ID >= 70400) {
+                throw $e;
+            }
+            trigger_error(sprintf('%s::__toString exception: %s', self::class, (string) $e), E_USER_ERROR);
+
+            return '';
+        }
+    }
+
+    public function close(): void
+    {
+        ($this->_fn_close)();
+    }
+
+    public function detach()
+    {
+        return ($this->_fn_detach)();
+    }
+
+    public function getSize(): ?int
+    {
+        return ($this->_fn_getSize)();
+    }
+
+    public function tell(): int
+    {
+        return ($this->_fn_tell)();
+    }
+
+    public function eof(): bool
+    {
+        return ($this->_fn_eof)();
+    }
+
+    public function isSeekable(): bool
+    {
+        return ($this->_fn_isSeekable)();
+    }
+
+    public function rewind(): void
+    {
+        ($this->_fn_rewind)();
+    }
+
+    public function seek($offset, $whence = SEEK_SET): void
+    {
+        ($this->_fn_seek)($offset, $whence);
+    }
+
+    public function isWritable(): bool
+    {
+        return ($this->_fn_isWritable)();
+    }
+
+    public function write($string): int
+    {
+        return ($this->_fn_write)($string);
+    }
+
+    public function isReadable(): bool
+    {
+        return ($this->_fn_isReadable)();
+    }
+
+    public function read($length): string
+    {
+        return ($this->_fn_read)($length);
+    }
+
+    public function getContents(): string
+    {
+        return ($this->_fn_getContents)();
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getMetadata($key = null)
+    {
+        return ($this->_fn_getMetadata)($key);
+    }
+}