zezere: role/playbook to deploy Zezere

Zezere is the Fedora IoT device provisioning service.  It is the
software that runs *provision.fedoraproject.org*, but it can be
self-hosted (if you can figure it out; there is no documentation
whatsoever).

The main use case for running Zezere locally is to automatically add
trusted SSH public keys to Fedora IoT devices, without depending on a
cloud service.  This playbook sets up Zezere with the very minimal
configuration needed to meet this goal.

zezere.yml

@@ -0,0 +1,6 @@
+- hosts: zezere
+  vars_files:
+  - vault/zezere/{{ inventory_hostname }}
+  roles:
+  - role: zezere
+    tags: zezere