How can change the domain name Vaultwarden (Linux Debian)

Hello, I was wondering what were the entirety of the files on linux debian to change the localhost IP address of vaultwarden to a specific domain name

Please provide extensive details of your setup. However I assume you deploy your Vaultwarden in a docker container which resides on Debian. For example like this:

docker run -d --name vaultwarden -v /srv/bitwarden:/data -e WEBSOCKET_ENABLED=true -p 0.0.0.0:3012:3012 -p 0.0.0.0:80:80 --restart always vaultwarden/server:latest

The only thing you define here is an IP address that your Vaultwarden will use. 0.0.0.0 means it will bind with all existing interfaces on your Debian. To access your Vaultwarden by domain from internet, you need to buy a domain, ask your ISP for public IP address, control your router and redirect HTTPS and HTTP ports to your Debian LAN IP adress. On Debian you need to install a reverse proxy (https://www.nginx.com/resources/glossary/reverse-proxy-server/) like HAProxy, Nginx or Apache. It can be just another docker container. This reverse proxy will receive traffic from internet and recognize your domain in the request and direct it to the container with your vaultwarden. The vaultwarden container is not self sufficient to provide you access by domain.