Updates to 3rd party libraries

Add Dockerfile and specific docker-php.ini

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

@@ -0,0 +1,32 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests\Shared;
+
+use PhpOffice\PhpSpreadsheet\Shared\File;
+use PHPUnit\Framework\TestCase;
+
+class FileTest extends TestCase
+{
+    public function testGetUseUploadTempDirectory()
+    {
+        $expectedResult = false;
+
+        $result = File::getUseUploadTempDirectory();
+        self::assertEquals($expectedResult, $result);
+    }
+
+    public function testSetUseUploadTempDirectory()
+    {
+        $useUploadTempDirectoryValues = [
+            true,
+            false,
+        ];
+
+        foreach ($useUploadTempDirectoryValues as $useUploadTempDirectoryValue) {
+            File::setUseUploadTempDirectory($useUploadTempDirectoryValue);
+
+            $result = File::getUseUploadTempDirectory();
+            self::assertEquals($useUploadTempDirectoryValue, $result);
+        }
+    }
+}