Updates to 3rd party libraries

Add Dockerfile and specific docker-php.ini

inc/vendor/phpoffice/phpspreadsheet/.sami.php

@@ -0,0 +1,24 @@
+<?php
+
+use Sami\RemoteRepository\GitHubRemoteRepository;
+use Sami\Sami;
+use Sami\Version\GitVersionCollection;
+use Symfony\Component\Finder\Finder;
+
+$iterator = Finder::create()
+    ->files()
+    ->name('*.php')
+    ->in($dir = __DIR__ . '/src');
+$versions = GitVersionCollection::create($dir)
+    ->addFromTags(function ($version) {
+        return preg_match('~^\d+\.\d+\.\d+$~', $version);
+    })
+    ->add('master');
+
+return new Sami($iterator, [
+    'title' => 'PhpSpreadsheet',
+    'versions' => $versions,
+    'build_dir' => __DIR__ . '/build/%version%',
+    'cache_dir' => __DIR__ . '/cache/%version%',
+    'remote_repository' => new GitHubRemoteRepository('PHPOffice/PhpSpreadsheet', dirname($dir)),
+]);