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/dragonmantank/cron-expression/src/Cron/DayOfMonthField.php

@@ -0,0 +1,164 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Cron;
+
+use DateTime;
+use DateTimeInterface;
+
+/**
+ * Day of month field.  Allows: * , / - ? L W.
+ *
+ * 'L' stands for "last" and specifies the last day of the month.
+ *
+ * The 'W' character is used to specify the weekday (Monday-Friday) nearest the
+ * given day. As an example, if you were to specify "15W" as the value for the
+ * day-of-month field, the meaning is: "the nearest weekday to the 15th of the
+ * month". So if the 15th is a Saturday, the trigger will fire on Friday the
+ * 14th. If the 15th is a Sunday, the trigger will fire on Monday the 16th. If
+ * the 15th is a Tuesday, then it will fire on Tuesday the 15th. However if you
+ * specify "1W" as the value for day-of-month, and the 1st is a Saturday, the
+ * trigger will fire on Monday the 3rd, as it will not 'jump' over the boundary
+ * of a month's days. The 'W' character can only be specified when the
+ * day-of-month is a single day, not a range or list of days.
+ *
+ * @author Michael Dowling <mtdowling@gmail.com>
+ */
+class DayOfMonthField extends AbstractField
+{
+    /**
+     * {@inheritdoc}
+     */
+    protected $rangeStart = 1;
+
+    /**
+     * {@inheritdoc}
+     */
+    protected $rangeEnd = 31;
+
+    /**
+     * Get the nearest day of the week for a given day in a month.
+     *
+     * @param int $currentYear Current year
+     * @param int $currentMonth Current month
+     * @param int $targetDay Target day of the month
+     *
+     * @return \DateTime|null Returns the nearest date
+     */
+    private static function getNearestWeekday(int $currentYear, int $currentMonth, int $targetDay): ?DateTime
+    {
+        $tday = str_pad((string) $targetDay, 2, '0', STR_PAD_LEFT);
+        $target = DateTime::createFromFormat('Y-m-d', "{$currentYear}-{$currentMonth}-{$tday}");
+
+        if ($target === false) {
+            return null;
+        }
+
+        $currentWeekday = (int) $target->format('N');
+
+        if ($currentWeekday < 6) {
+            return $target;
+        }
+
+        $lastDayOfMonth = $target->format('t');
+        foreach ([-1, 1, -2, 2] as $i) {
+            $adjusted = $targetDay + $i;
+            if ($adjusted > 0 && $adjusted <= $lastDayOfMonth) {
+                $target->setDate($currentYear, $currentMonth, $adjusted);
+
+                if ((int) $target->format('N') < 6 && (int) $target->format('m') === $currentMonth) {
+                    return $target;
+                }
+            }
+        }
+
+        return null;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function isSatisfiedBy(DateTimeInterface $date, $value, bool $invert): bool
+    {
+        // ? states that the field value is to be skipped
+        if ('?' === $value) {
+            return true;
+        }
+
+        $fieldValue = $date->format('d');
+
+        // Check to see if this is the last day of the month
+        if ('L' === $value) {
+            return $fieldValue === $date->format('t');
+        }
+
+        // Check to see if this is the nearest weekday to a particular value
+        if ($wPosition = strpos($value, 'W')) {
+            // Parse the target day
+            $targetDay = (int) substr($value, 0, $wPosition);
+            // Find out if the current day is the nearest day of the week
+            $nearest = self::getNearestWeekday(
+                (int) $date->format('Y'),
+                (int) $date->format('m'),
+                $targetDay
+            );
+            if ($nearest) {
+                return $date->format('j') === $nearest->format('j');
+            }
+
+            throw new \RuntimeException('Unable to return nearest weekday');
+        }
+
+        return $this->isSatisfied((int) $date->format('d'), $value);
+    }
+
+    /**
+     * @inheritDoc
+     *
+     * @param \DateTime|\DateTimeImmutable $date
+     */
+    public function increment(DateTimeInterface &$date, $invert = false, $parts = null): FieldInterface
+    {
+        if (! $invert) {
+            $date = $date->add(new \DateInterval('P1D'));
+            $date = $date->setTime(0, 0);
+        } else {
+            $date = $date->sub(new \DateInterval('P1D'));
+            $date = $date->setTime(23, 59);
+        }
+
+        return $this;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function validate(string $value): bool
+    {
+        $basicChecks = parent::validate($value);
+
+        // Validate that a list don't have W or L
+        if (false !== strpos($value, ',') && (false !== strpos($value, 'W') || false !== strpos($value, 'L'))) {
+            return false;
+        }
+
+        if (!$basicChecks) {
+            if ('?' === $value) {
+                return true;
+            }
+
+            if ('L' === $value) {
+                return true;
+            }
+
+            if (preg_match('/^(.*)W$/', $value, $matches)) {
+                return $this->validate($matches[1]);
+            }
+
+            return false;
+        }
+
+        return $basicChecks;
+    }
+}