add missing ,

.drone.star

@@ -93,7 +93,7 @@ def buildContainer(PHP_VERSION, ALPINE_VERSION, TESTING_REPO, PHP_SESSION):
             'name': 'sockets',
             'path': '/var/run'
           },
-        ]
+        ],
         'commands': [
           '''while [ ! -S /var/run/docker.sock ]; do
                 echo "Waiting for docker socket..."