Container-dns config on EKS

Hello community.
Does anybody have experience running shinyproxy on aws eks cluster? We need to add a resolver to /etc/resolv.conf, and seems like there is a special option for this: container-dns. The problem is that it does not work for us. It does not impact on resolv.conf file content at all. Do you have any suggestions?
We have the latest shinyproxy version and kubernetes 1.29
Thank you.