add concourse public key to swarm manager authorized hosts

ansible/playbooks/setup.yml

@@ -49,9 +49,7 @@
 
 - hosts: manager
   tasks:
-    - name: Add labels to Docker Swarm
-      docker_node:
-        hostname: "{{ item.hostname }}"
-        labels: "{{ item.labels }}"
-        labels_state: replace
-      loop: "{{ docker_node_labels }}"
+    - name: Add concourse to authorized keys
+      authorized_key:
+        user: root
+        key: "{{ concourse_public_key }}"