feat: add motd and facts

- use parameters created by the enc to create external facts
- use external facts to generate the motd
- use features from unkinben/puppet-enc#22

site/profiles/templates/base/facts/enc_env.erb

@@ -0,0 +1 @@
+enc_env=<%= @enc_env %>

site/profiles/templates/base/facts/enc_role.erb

@@ -0,0 +1 @@
+enc_role=<%= @enc_role[0] %>

site/profiles/templates/base/motd/motd.erb

@@ -0,0 +1,13 @@
+<%
+# calculate padding for the longest word
+max_length = ['fqdn:', 'os:', 'role:', 'branch:', 'addr:', 'nic:'].max_by(&:length).length
+# helper lambda to right-align text
+align = ->(word) { word.ljust(max_length) }
+%>
+<%= align.call('fqdn:') %> <%= @fqdn %>
+<%= align.call('os:') %> <%= @os_name %> <%= @os_release %>
+<%= align.call('role:') %> <%= @clean_role %>
+<%= align.call('branch:') %> <%= @enc_env %>
+<%= align.call('addr:') %> <%= @addr %>
+<%= align.call('nic:') %> <%= @nic %>
+