Use server name from attribute everywhere

site-cookbooks/kosmos-mastodon/recipes/nginx.rb

@@ -38,7 +38,7 @@ end
 
 unless node.chef_environment == "development"
   include_recipe "kosmos-base::letsencrypt"
-  execute "letsencrypt cert for kosmos.social" do
+  execute "letsencrypt cert for #{server_name}" do
     command "./certbot-auto certonly --webroot --agree-tos --email ops@5apps.com --webroot-path /var/www/mastodon -d #{server_name} -n"
     cwd "/usr/local/certbot"
     not_if { File.exist? "/etc/letsencrypt/live/#{server_name}/fullchain.pem" }