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/InflateStream.php

@@ -0,0 +1,37 @@
+<?php
+
+declare(strict_types=1);
+
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Uses PHP's zlib.inflate filter to inflate zlib (HTTP deflate, RFC1950) or gzipped (RFC1952) content.
+ *
+ * This stream decorator converts the provided stream to a PHP stream resource,
+ * then appends the zlib.inflate filter. The stream is then converted back
+ * to a Guzzle stream resource to be used as a Guzzle stream.
+ *
+ * @see https://datatracker.ietf.org/doc/html/rfc1950
+ * @see https://datatracker.ietf.org/doc/html/rfc1952
+ * @see https://www.php.net/manual/en/filters.compression.php
+ */
+final class InflateStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+
+    /** @var StreamInterface */
+    private $stream;
+
+    public function __construct(StreamInterface $stream)
+    {
+        $resource = StreamWrapper::getResource($stream);
+        // Specify window=15+32, so zlib will use header detection to both gzip (with header) and zlib data
+        // See https://www.zlib.net/manual.html#Advanced definition of inflateInit2
+        // "Add 32 to windowBits to enable zlib and gzip decoding with automatic header detection"
+        // Default window size is 15.
+        stream_filter_append($resource, 'zlib.inflate', STREAM_FILTER_READ, ['window' => 15 + 32]);
+        $this->stream = $stream->isSeekable() ? new Stream($resource) : new NoSeekStream(new Stream($resource));
+    }
+}