Docker. How to allow container to backup resolv.conf and modify it?

Question

ubuntu

Good afternoon.

I'm making a container with a vpn client inside.
The Vpn client makes a copy of /etc/resolv.conf to /etc/resolv.conf.orig on connection and makes changes to /etc/resolv.conf.
Is it possible to somehow allow these manipulations to the docker?
As for changing /etc/resolv.conf, as I understand it, you can decide -v /etc/resolv.conf:/etc/resolv.conf, but what about /etc/resolv.conf.orig? After all, the container must create it, it can create it at home, but on the host?

Thanks in advance for your help