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/league/config/src/Exception/ConfigurationExceptionInterface.php

@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the league/config package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\Config\Exception;
+
+/**
+ * Marker interface for any/all exceptions thrown by this library
+ */
+interface ConfigurationExceptionInterface extends \Throwable
+{
+}

docker/streamline-src/vendor/league/config/src/Exception/InvalidConfigurationException.php

@@ -0,0 +1,46 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the league/config package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\Config\Exception;
+
+class InvalidConfigurationException extends \UnexpectedValueException implements ConfigurationExceptionInterface
+{
+    /**
+     * @param string  $option      Name/path of the option
+     * @param mixed   $valueGiven  The invalid option that was provided
+     * @param ?string $description Additional text describing the issue (optional)
+     */
+    public static function forConfigOption(string $option, $valueGiven, ?string $description = null): self
+    {
+        $message = \sprintf('Invalid config option for "%s": %s', $option, self::getDebugValue($valueGiven));
+        if ($description !== null) {
+            $message .= \sprintf(' (%s)', $description);
+        }
+
+        return new self($message);
+    }
+
+    /**
+     * @param mixed $value
+     *
+     * @psalm-pure
+     */
+    private static function getDebugValue($value): string
+    {
+        if (\is_object($value)) {
+            return \get_class($value);
+        }
+
+        return \print_r($value, true);
+    }
+}

docker/streamline-src/vendor/league/config/src/Exception/UnknownOptionException.php

@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the league/config package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\Config\Exception;
+
+use Throwable;
+
+final class UnknownOptionException extends \InvalidArgumentException implements ConfigurationExceptionInterface
+{
+    private string $path;
+
+    public function __construct(string $message, string $path, int $code = 0, ?Throwable $previous = null)
+    {
+        parent::__construct($message, $code, $previous);
+
+        $this->path = $path;
+    }
+
+    public function getPath(): string
+    {
+        return $this->path;
+    }
+}

docker/streamline-src/vendor/league/config/src/Exception/ValidationException.php

@@ -0,0 +1,37 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the league/config package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\Config\Exception;
+
+use Nette\Schema\ValidationException as NetteException;
+
+final class ValidationException extends InvalidConfigurationException
+{
+    /** @var string[] */
+    private array $messages;
+
+    public function __construct(NetteException $innerException)
+    {
+        parent::__construct($innerException->getMessage(), (int) $innerException->getCode(), $innerException);
+
+        $this->messages = $innerException->getMessages();
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getMessages(): array
+    {
+        return $this->messages;
+    }
+}