Updates to 3rd party libraries

Add Dockerfile and specific docker-php.ini

inc/vendor/phpoffice/phpspreadsheet/tests/PhpSpreadsheetTests/Shared/TimeZoneTest.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests\Shared;
+
+use PhpOffice\PhpSpreadsheet\Shared\TimeZone;
+use PHPUnit\Framework\TestCase;
+
+class TimeZoneTest extends TestCase
+{
+    public function testSetTimezone()
+    {
+        $timezoneValues = [
+            'Europe/Prague',
+            'Asia/Tokyo',
+            'America/Indiana/Indianapolis',
+            'Pacific/Honolulu',
+            'Atlantic/St_Helena',
+        ];
+
+        foreach ($timezoneValues as $timezoneValue) {
+            $result = TimeZone::setTimezone($timezoneValue);
+            self::assertTrue($result);
+        }
+    }
+
+    public function testSetTimezoneWithInvalidValue()
+    {
+        $unsupportedTimezone = 'Etc/GMT+10';
+        $result = TimeZone::setTimezone($unsupportedTimezone);
+        self::assertFalse($result);
+    }
+}