attributes

Attributes file
default['jenkins']['servername'] = "jenkins.schibsted.se"

template file
<VirtualHost *:80>
	ServerName <%= node[:httpd][:servername] %>
	RewriteEngine on
	RewriteCond %{SERVER_PORT} =80
	RewriteRule ^(.*) https://%{SERVER_NAME}%{REQUEST_URI}
</VirtualHost>

Server output
<VirtualHost *:80>
	ServerName jenkins.schibsted.se
	RewriteEngine on
	RewriteCond %{SERVER_PORT} =80
	RewriteRule ^(.*) https://%{SERVER_NAME}%{REQUEST_URI}
</VirtualHost>