add cyberia-cloudinit.yml to docs

docs/deployment.md

@@ -15,7 +15,24 @@ sudo wget https://cloud.debian.org/images/cloud/buster/20201023-432/debian-10-ge
 ```
 
 TODO: network set-up
-TODO: cyberia-cloudinit.yml
+
+
+## cyberia-cloudinit.yml
+
+The create vm shell script depends on this file. I think right now its file path is hard-coded to `/tank/config/cyberia-cloudinit.yml`
+
+```
+#cloud-config
+preserve_hostname: true
+users:
+  - name: cyberian
+    groups: wheel
+    lock_passwd: true
+    shell: /bin/bash
+    sudo: ['ALL=(ALL) NOPASSWD:ALL']
+    ssh-authorized_keys:
+```
+
 
 ## Deploying capsul-flask