Enable object storage tests again

Signed-off-by: Morris Jobke <hey@morrisjobke.de>

.drone.yml

@@ -590,8 +590,8 @@ matrix:
     - TESTS: caldavtester-new-endpoint
     - TESTS: carddavtester-new-endpoint
     - TESTS: carddavtester-old-endpoint
-#    - TESTS: object-store
-#      OBJECT_STORE: s3
+    - TESTS: object-store
+      OBJECT_STORE: s3
     - TESTS: sqlite-php7.0-samba-native
     - TESTS: sqlite-php7.0-samba-non-native
     - TEST: memcache-memcached

tests/preseed-config.php

@@ -30,7 +30,7 @@ if (getenv('OBJECT_STORE') === 's3') {
 			'autocreate' => true,
 			'key' => 'dummy',
 			'secret' => 'dummy',
-			'hostname' => 'localhost',
+			'hostname' => getenv('DRONE') === 'true' ? 'fake-s3' : 'localhost',
 			'port' => 4569,
 			'use_ssl' => false,
 			// required for some non amazon s3 implementations