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/myclabs/deep-copy/src/DeepCopy/DeepCopy.php

@@ -0,0 +1,308 @@
+<?php
+
+namespace DeepCopy;
+
+use ArrayObject;
+use DateInterval;
+use DateTimeInterface;
+use DateTimeZone;
+use DeepCopy\Exception\CloneException;
+use DeepCopy\Filter\ChainableFilter;
+use DeepCopy\Filter\Filter;
+use DeepCopy\Matcher\Matcher;
+use DeepCopy\Reflection\ReflectionHelper;
+use DeepCopy\TypeFilter\Date\DateIntervalFilter;
+use DeepCopy\TypeFilter\Spl\ArrayObjectFilter;
+use DeepCopy\TypeFilter\Spl\SplDoublyLinkedListFilter;
+use DeepCopy\TypeFilter\TypeFilter;
+use DeepCopy\TypeMatcher\TypeMatcher;
+use ReflectionObject;
+use ReflectionProperty;
+use SplDoublyLinkedList;
+
+/**
+ * @final
+ */
+class DeepCopy
+{
+    /**
+     * @var object[] List of objects copied.
+     */
+    private $hashMap = [];
+
+    /**
+     * Filters to apply.
+     *
+     * @var array Array of ['filter' => Filter, 'matcher' => Matcher] pairs.
+     */
+    private $filters = [];
+
+    /**
+     * Type Filters to apply.
+     *
+     * @var array Array of ['filter' => Filter, 'matcher' => Matcher] pairs.
+     */
+    private $typeFilters = [];
+
+    /**
+     * @var bool
+     */
+    private $skipUncloneable = false;
+
+    /**
+     * @var bool
+     */
+    private $useCloneMethod;
+
+    /**
+     * @param bool $useCloneMethod   If set to true, when an object implements the __clone() function, it will be used
+     *                               instead of the regular deep cloning.
+     */
+    public function __construct($useCloneMethod = false)
+    {
+        $this->useCloneMethod = $useCloneMethod;
+
+        $this->addTypeFilter(new ArrayObjectFilter($this), new TypeMatcher(ArrayObject::class));
+        $this->addTypeFilter(new DateIntervalFilter(), new TypeMatcher(DateInterval::class));
+        $this->addTypeFilter(new SplDoublyLinkedListFilter($this), new TypeMatcher(SplDoublyLinkedList::class));
+    }
+
+    /**
+     * If enabled, will not throw an exception when coming across an uncloneable property.
+     *
+     * @param $skipUncloneable
+     *
+     * @return $this
+     */
+    public function skipUncloneable($skipUncloneable = true)
+    {
+        $this->skipUncloneable = $skipUncloneable;
+
+        return $this;
+    }
+
+    /**
+     * Deep copies the given object.
+     *
+     * @param mixed $object
+     *
+     * @return mixed
+     */
+    public function copy($object)
+    {
+        $this->hashMap = [];
+
+        return $this->recursiveCopy($object);
+    }
+
+    public function addFilter(Filter $filter, Matcher $matcher)
+    {
+        $this->filters[] = [
+            'matcher' => $matcher,
+            'filter'  => $filter,
+        ];
+    }
+
+    public function prependFilter(Filter $filter, Matcher $matcher)
+    {
+        array_unshift($this->filters, [
+            'matcher' => $matcher,
+            'filter'  => $filter,
+        ]);
+    }
+
+    public function addTypeFilter(TypeFilter $filter, TypeMatcher $matcher)
+    {
+        $this->typeFilters[] = [
+            'matcher' => $matcher,
+            'filter'  => $filter,
+        ];
+    }
+
+    private function recursiveCopy($var)
+    {
+        // Matches Type Filter
+        if ($filter = $this->getFirstMatchedTypeFilter($this->typeFilters, $var)) {
+            return $filter->apply($var);
+        }
+
+        // Resource
+        if (is_resource($var)) {
+            return $var;
+        }
+
+        // Array
+        if (is_array($var)) {
+            return $this->copyArray($var);
+        }
+
+        // Scalar
+        if (! is_object($var)) {
+            return $var;
+        }
+
+        // Enum
+        if (PHP_VERSION_ID >= 80100 && enum_exists(get_class($var))) {
+            return $var;
+        }
+
+        // Object
+        return $this->copyObject($var);
+    }
+
+    /**
+     * Copy an array
+     * @param array $array
+     * @return array
+     */
+    private function copyArray(array $array)
+    {
+        foreach ($array as $key => $value) {
+            $array[$key] = $this->recursiveCopy($value);
+        }
+
+        return $array;
+    }
+
+    /**
+     * Copies an object.
+     *
+     * @param object $object
+     *
+     * @throws CloneException
+     *
+     * @return object
+     */
+    private function copyObject($object)
+    {
+        $objectHash = spl_object_hash($object);
+
+        if (isset($this->hashMap[$objectHash])) {
+            return $this->hashMap[$objectHash];
+        }
+
+        $reflectedObject = new ReflectionObject($object);
+        $isCloneable = $reflectedObject->isCloneable();
+
+        if (false === $isCloneable) {
+            if ($this->skipUncloneable) {
+                $this->hashMap[$objectHash] = $object;
+
+                return $object;
+            }
+
+            throw new CloneException(
+                sprintf(
+                    'The class "%s" is not cloneable.',
+                    $reflectedObject->getName()
+                )
+            );
+        }
+
+        $newObject = clone $object;
+        $this->hashMap[$objectHash] = $newObject;
+
+        if ($this->useCloneMethod && $reflectedObject->hasMethod('__clone')) {
+            return $newObject;
+        }
+
+        if ($newObject instanceof DateTimeInterface || $newObject instanceof DateTimeZone) {
+            return $newObject;
+        }
+
+        foreach (ReflectionHelper::getProperties($reflectedObject) as $property) {
+            $this->copyObjectProperty($newObject, $property);
+        }
+
+        return $newObject;
+    }
+
+    private function copyObjectProperty($object, ReflectionProperty $property)
+    {
+        // Ignore static properties
+        if ($property->isStatic()) {
+            return;
+        }
+
+        // Apply the filters
+        foreach ($this->filters as $item) {
+            /** @var Matcher $matcher */
+            $matcher = $item['matcher'];
+            /** @var Filter $filter */
+            $filter = $item['filter'];
+
+            if ($matcher->matches($object, $property->getName())) {
+                $filter->apply(
+                    $object,
+                    $property->getName(),
+                    function ($object) {
+                        return $this->recursiveCopy($object);
+                    }
+                );
+
+                if ($filter instanceof ChainableFilter) {
+                    continue;
+                }
+
+                // If a filter matches, we stop processing this property
+                return;
+            }
+        }
+
+        $property->setAccessible(true);
+
+        // Ignore uninitialized properties (for PHP >7.4)
+        if (method_exists($property, 'isInitialized') && !$property->isInitialized($object)) {
+            return;
+        }
+
+        $propertyValue = $property->getValue($object);
+
+        // Copy the property
+        $property->setValue($object, $this->recursiveCopy($propertyValue));
+    }
+
+    /**
+     * Returns first filter that matches variable, `null` if no such filter found.
+     *
+     * @param array $filterRecords Associative array with 2 members: 'filter' with value of type {@see TypeFilter} and
+     *                             'matcher' with value of type {@see TypeMatcher}
+     * @param mixed $var
+     *
+     * @return TypeFilter|null
+     */
+    private function getFirstMatchedTypeFilter(array $filterRecords, $var)
+    {
+        $matched = $this->first(
+            $filterRecords,
+            function (array $record) use ($var) {
+                /* @var TypeMatcher $matcher */
+                $matcher = $record['matcher'];
+
+                return $matcher->matches($var);
+            }
+        );
+
+        return isset($matched) ? $matched['filter'] : null;
+    }
+
+    /**
+     * Returns first element that matches predicate, `null` if no such element found.
+     *
+     * @param array    $elements Array of ['filter' => Filter, 'matcher' => Matcher] pairs.
+     * @param callable $predicate Predicate arguments are: element.
+     *
+     * @return array|null Associative array with 2 members: 'filter' with value of type {@see TypeFilter} and 'matcher'
+     *                    with value of type {@see TypeMatcher} or `null`.
+     */
+    private function first(array $elements, callable $predicate)
+    {
+        foreach ($elements as $element) {
+            if (call_user_func($predicate, $element)) {
+                return $element;
+            }
+        }
+
+        return null;
+    }
+}