allow setting a floating ip in config when using digitalocean

config.cfg

@@ -108,9 +108,12 @@ cloud_providers:
   azure:
     size: Basic_A0
     image: 18.04-LTS
+  # To use floating_ip, first allocate a floating IP via Digital Ocean, and
+  # then set floating_ip to the IP address that was allocated.
   digitalocean:
     size: s-1vcpu-1gb
     image: "ubuntu-18-04-x64"
+    floating_ip: false
   # Change the encrypted flag to "true" to enable AWS volume encryption, for encryption of data at rest.
   # Warning: the Algo script will take approximately 6 minutes longer to complete.
   # Also note that the documented AWS minimum permissions aren't sufficient.

roles/cloud-digitalocean/tasks/main.yml

@@ -60,8 +60,16 @@
         ipv6: yes
       register: do
 
+    - name: "Assigning floating IP..."
+      digital_ocean_floating_ip:
+        oauth_token: "{{ algo_do_token }}"
+        ip: "{{ cloud_providers.digitalocean.floating_ip }}"
+        droplet_id: "{{ do.droplet.id }}"
+      when:
+        - cloud_providers.digitalocean.floating_ip
+
     - set_fact:
-        cloud_instance_ip: "{{ do.droplet.ip_address }}"
+        cloud_instance_ip: "{% if cloud_providers.digitalocean.floating_ip %}{{ cloud_providers.digitalocean.floating_ip }}{% else %}{{ do.droplet.ip_address }}{% endif %}"
         ansible_ssh_user: root
 
     - name: Tag the droplet