Add a dynamic DNS feature

[joaodforce]

Considering NPM is commonly used to self host services I find that if it had builtin support for dynamic DNS it would be very handy. Like building a simple front end for DDCLIENT.

Most people use their routers for the DDNS tasks but I find that most routers only have support for some DyDNS providers.
While more robust DNS providers like Cloudflare are left out for example. So I usually find myself hosting it in a random vm or container and usually forget where I set it up and have a bad time combing through servers to find it.

[saltedlolly]

Yes - please add this! Including ddclient in the docker container, with the ability to manage it from the Nginx Proxy Manager webui would be so useful. Most home users don't have a static IP so making DDNS really simple would great.

Personally, the hardest part of entire setup of remote access to my Audiobookshelf server was getting ddclient working in a second docker container. It would be great if it was entirely integrated.