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/sebastian/lines-of-code/src/LinesOfCode.php

@@ -0,0 +1,119 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/lines-of-code.
+ *
+ * (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\LinesOfCode;
+
+/**
+ * @psalm-immutable
+ */
+final class LinesOfCode
+{
+    /**
+     * @psalm-var non-negative-int
+     */
+    private readonly int $linesOfCode;
+
+    /**
+     * @psalm-var non-negative-int
+     */
+    private readonly int $commentLinesOfCode;
+
+    /**
+     * @psalm-var non-negative-int
+     */
+    private readonly int $nonCommentLinesOfCode;
+
+    /**
+     * @psalm-var non-negative-int
+     */
+    private readonly int $logicalLinesOfCode;
+
+    /**
+     * @psalm-param non-negative-int $linesOfCode
+     * @psalm-param non-negative-int $commentLinesOfCode
+     * @psalm-param non-negative-int $nonCommentLinesOfCode
+     * @psalm-param non-negative-int $logicalLinesOfCode
+     *
+     * @throws IllogicalValuesException
+     * @throws NegativeValueException
+     */
+    public function __construct(int $linesOfCode, int $commentLinesOfCode, int $nonCommentLinesOfCode, int $logicalLinesOfCode)
+    {
+        /** @psalm-suppress DocblockTypeContradiction */
+        if ($linesOfCode < 0) {
+            throw new NegativeValueException('$linesOfCode must not be negative');
+        }
+
+        /** @psalm-suppress DocblockTypeContradiction */
+        if ($commentLinesOfCode < 0) {
+            throw new NegativeValueException('$commentLinesOfCode must not be negative');
+        }
+
+        /** @psalm-suppress DocblockTypeContradiction */
+        if ($nonCommentLinesOfCode < 0) {
+            throw new NegativeValueException('$nonCommentLinesOfCode must not be negative');
+        }
+
+        /** @psalm-suppress DocblockTypeContradiction */
+        if ($logicalLinesOfCode < 0) {
+            throw new NegativeValueException('$logicalLinesOfCode must not be negative');
+        }
+
+        if ($linesOfCode - $commentLinesOfCode !== $nonCommentLinesOfCode) {
+            throw new IllogicalValuesException('$linesOfCode !== $commentLinesOfCode + $nonCommentLinesOfCode');
+        }
+
+        $this->linesOfCode           = $linesOfCode;
+        $this->commentLinesOfCode    = $commentLinesOfCode;
+        $this->nonCommentLinesOfCode = $nonCommentLinesOfCode;
+        $this->logicalLinesOfCode    = $logicalLinesOfCode;
+    }
+
+    /**
+     * @psalm-return non-negative-int
+     */
+    public function linesOfCode(): int
+    {
+        return $this->linesOfCode;
+    }
+
+    /**
+     * @psalm-return non-negative-int
+     */
+    public function commentLinesOfCode(): int
+    {
+        return $this->commentLinesOfCode;
+    }
+
+    /**
+     * @psalm-return non-negative-int
+     */
+    public function nonCommentLinesOfCode(): int
+    {
+        return $this->nonCommentLinesOfCode;
+    }
+
+    /**
+     * @psalm-return non-negative-int
+     */
+    public function logicalLinesOfCode(): int
+    {
+        return $this->logicalLinesOfCode;
+    }
+
+    public function plus(self $other): self
+    {
+        return new self(
+            $this->linesOfCode() + $other->linesOfCode(),
+            $this->commentLinesOfCode() + $other->commentLinesOfCode(),
+            $this->nonCommentLinesOfCode() + $other->nonCommentLinesOfCode(),
+            $this->logicalLinesOfCode() + $other->logicalLinesOfCode(),
+        );
+    }
+}