Pass array instead on integer to API for ssh key

openappstack/cluster.py

@@ -97,7 +97,7 @@ class Cluster:
             hostname = self.name
         droplet = greenhost_cloud.create_droplet(
             name=hostname,
-            ssh_key_id=ssh_key_id,
+            ssh_key_id=[ssh_key_id],
             region=DEFAULT_REGION,
             size=DEFAULT_MEMORY_SIZE_MB,
             disk=DEFAULT_DISK_SIZE_GB,