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/phpunit/php-text-template/src/Template.php

@@ -0,0 +1,108 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of phpunit/php-text-template.
+ *
+ * (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\Template;
+
+use function array_keys;
+use function array_merge;
+use function file_get_contents;
+use function file_put_contents;
+use function is_file;
+use function sprintf;
+use function str_replace;
+
+final class Template
+{
+    private string $template = '';
+    private string $openDelimiter;
+    private string $closeDelimiter;
+
+    /**
+     * @psalm-var array<string,string>
+     */
+    private array $values = [];
+
+    /**
+     * @throws InvalidArgumentException
+     */
+    public function __construct(string $file = '', string $openDelimiter = '{', string $closeDelimiter = '}')
+    {
+        $this->setFile($file);
+
+        $this->openDelimiter  = $openDelimiter;
+        $this->closeDelimiter = $closeDelimiter;
+    }
+
+    /**
+     * @throws InvalidArgumentException
+     */
+    public function setFile(string $file): void
+    {
+        if (is_file($file)) {
+            $this->template = file_get_contents($file);
+
+            return;
+        }
+
+        $distFile = $file . '.dist';
+
+        if (is_file($distFile)) {
+            $this->template = file_get_contents($distFile);
+
+            return;
+        }
+
+        throw new InvalidArgumentException(
+            sprintf(
+                'Failed to load template "%s"',
+                $file
+            )
+        );
+    }
+
+    /**
+     * @psalm-param array<string,string> $values
+     */
+    public function setVar(array $values, bool $merge = true): void
+    {
+        if (!$merge || empty($this->values)) {
+            $this->values = $values;
+
+            return;
+        }
+
+        $this->values = array_merge($this->values, $values);
+    }
+
+    public function render(): string
+    {
+        $keys = [];
+
+        foreach (array_keys($this->values) as $key) {
+            $keys[] = $this->openDelimiter . $key . $this->closeDelimiter;
+        }
+
+        return str_replace($keys, $this->values, $this->template);
+    }
+
+    /**
+     * @codeCoverageIgnore
+     */
+    public function renderTo(string $target): void
+    {
+        if (!@file_put_contents($target, $this->render())) {
+            throw new RuntimeException(
+                sprintf(
+                    'Writing rendered result to "%s" failed',
+                    $target
+                )
+            );
+        }
+    }
+}

docker/streamline-src/vendor/phpunit/php-text-template/src/exceptions/Exception.php

@@ -0,0 +1,16 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of phpunit/php-text-template.
+ *
+ * (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\Template;
+
+use Throwable;
+
+interface Exception extends Throwable
+{
+}

docker/streamline-src/vendor/phpunit/php-text-template/src/exceptions/InvalidArgumentException.php

@@ -0,0 +1,14 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of phpunit/php-text-template.
+ *
+ * (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\Template;
+
+final class InvalidArgumentException extends \InvalidArgumentException implements Exception
+{
+}

docker/streamline-src/vendor/phpunit/php-text-template/src/exceptions/RuntimeException.php

@@ -0,0 +1,16 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of phpunit/php-text-template.
+ *
+ * (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\Template;
+
+use InvalidArgumentException;
+
+final class RuntimeException extends InvalidArgumentException implements Exception
+{
+}