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/laravel/prompts/src/Output/ConsoleOutput.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace Laravel\Prompts\Output;
+
+use Symfony\Component\Console\Output\ConsoleOutput as SymfonyConsoleOutput;
+
+class ConsoleOutput extends SymfonyConsoleOutput
+{
+    /**
+     * How many new lines were written by the last output.
+     */
+    protected int $newLinesWritten = 1;
+
+    /**
+     * How many new lines were written by the last output.
+     */
+    public function newLinesWritten(): int
+    {
+        return $this->newLinesWritten;
+    }
+
+    /**
+     * Write the output and capture the number of trailing new lines.
+     */
+    protected function doWrite(string $message, bool $newline): void
+    {
+        parent::doWrite($message, $newline);
+
+        if ($newline) {
+            $message .= \PHP_EOL;
+        }
+
+        $trailingNewLines = strlen($message) - strlen(rtrim($message, \PHP_EOL));
+
+        if (trim($message) === '') {
+            $this->newLinesWritten += $trailingNewLines;
+        } else {
+            $this->newLinesWritten = $trailingNewLines;
+        }
+    }
+
+    /**
+     * Write output directly, bypassing newline capture.
+     */
+    public function writeDirectly(string $message): void
+    {
+        parent::doWrite($message, false);
+    }
+}