lib/terraforming/template/tf/iam_group_membership.erb
<% iam_groups.each do |group| -%>
resource "aws_iam_group_membership" "<%= module_name_of(group) %>" {
name = "<%= membership_name_of(group) %>"
users = <%= group_members_of(group).inspect %>
group = "<%= group.group_name %>"
}
<% end -%>