Add Drone CI

- Add drone test environment
- Add drone config
- apt phpunit
- Fix api.php
- Fix item.php
- Fix DBStructure
- Check if caching is possible during tests

mod/item.php

@@ -42,7 +42,7 @@ use Friendica\Util\Security;
 use Friendica\Util\Strings;
 use Friendica\Worker\Delivery;
 
-require_once 'include/items.php';
+require_once __DIR__ . '/../include/items.php';
 
 function item_post(App $a) {
 	if (!local_user() && !remote_user()) {