feature: add default config for nextcloud 21 with S3 storage, smtp and rewrite URL

nextcloud/var/www/html/nextcloud/config/config.php.s3

@@ -0,0 +1,64 @@
+<?php
+$CONFIG = array (
+  'instanceid' => '',
+  'passwordsalt' => '',
+  'secret' => '',
+  'trusted_domains' => 
+  array (
+    0 => 'your_domain',
+  ),
+  'datadirectory' => '/var/www/html/nextcloud/data',
+  'dbtype' => 'mysql',
+  'version' => '21.0.3.1',
+  'overwrite.cli.url' => 'http://your_domain/',
+  'htaccess.RewriteBase' => '/',
+  'dbname' => 'nextcloud',
+  'dbhost' => 'host:port',
+  'dbport' => '',
+  'dbtableprefix' => 'oc_',
+  'mysql.utf8mb4' => true,
+  'dbuser' => 'user',
+  'dbpassword' => 'pass',
+  'installed' => true,
+  'memcache.distributed' => '\\OC\\Memcache\\Redis',
+  'memcache.locking' => '\\OC\\Memcache\\Redis',
+  'memcache.local' => '\\OC\\Memcache\\Redis',
+  'log_type' => 'syslog',
+  'logfile' => '',
+  'loglevel' => '3',
+  'redis' => 
+  array (
+    'host' => 'localhost',
+    'port' => 6379,
+  ),
+  'objectstore' => 
+  array (
+    'class' => '\\OC\\Files\\ObjectStore\\S3',
+    'arguments' => 
+    array (
+      'bucket' => 'name',
+      'autocreate' => true,
+      'key' => '',
+      'secret' => '',
+      'hostname' => '',
+      'region' => '',
+      'port' => 443,
+      'use_ssl' => true,
+      'use_path_style' => true,
+    ),
+  ),
+  'mail_smtpmode' => 'smtp',
+  'mail_smtphost' => '',
+  'mail_smtpport' => '587',
+  'mail_smtptimeout' => 10,
+  'mail_from_address' => 'no-reply',
+  'mail_sendmailmode' => 'pipe',
+  'mail_domain' => 'your_domain',
+  'mail_smtpsecure' => 'tls',
+  'mail_smtpauthtype' => 'LOGIN',
+  'mail_smtpauth' => 1,
+  'mail_smtpname' => '',
+  'mail_smtppassword' => '',
+  'maintenance' => false,
+  'default_phone_region' => 'IT',
+);