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

include/api.php

@@ -48,9 +48,9 @@ use Friendica\Util\Proxy as ProxyUtils;
 use Friendica\Util\Strings;
 use Friendica\Util\XML;
 
-require_once 'mod/share.php';
-require_once 'mod/item.php';
-require_once 'mod/wall_upload.php';
+require_once __DIR__ . '/../mod/share.php';
+require_once __DIR__ . '/../mod/item.php';
+require_once __DIR__ . '/../mod/wall_upload.php';
 
 define('API_METHOD_ANY', '*');
 define('API_METHOD_GET', 'GET');