add servers.coop cloud-init.yml to docs

docs/deployment.md

@@ -33,6 +33,27 @@ users:
     ssh-authorized_keys:
 ```
 
+### autonomic / servers.coop version for ipv6 support 
+
+```
+#cloud-config
+package_upgrade: true
+packages:
+  - curl
+  - wget
+  - git
+  - vim
+bootcmd:
+  - echo 'iface ens3 inet6 dhcp' >> /etc/network/interfaces.d/50-cloud-init
+  - ifdown ens3; ifup ens3
+final_message: "The system is finally up, after $UPTIME seconds"
+users:
+  - name: user
+    groups: sudo
+    sudo: ['ALL=(ALL) NOPASSWD:ALL']
+    ssh-authorized-keys:
+```
+
 
 ## Deploying capsul-flask