cookbooks/fb_reprepro/templates/default/config.erb

<% node['fb_reprepro'][@config].to_hash.each do |_name, config| -%>
<%   config.each do |key, val| -%>
<%=    key %>: <%= val.is_a?(Array) ? val.join(' ') : val %>
<%   end -%>

<% end -%>