add script for creating VM image

lib/execute.rb

@@ -119,6 +119,13 @@ module Execute
     end
   end
 
+  def domain(name)
+    require 'certbot'
+    wildcard = name.strip.start_with?("*.")
+    domain = name.strip.delete_prefix("*.")
+    Certbot.create_certificate(domain, wildcard) 
+  end
+
   def user(*users)
     require 'user'
     users.each do |name|