Restrict container access to only few required domains

[JoAMD]

I wanted to make sure that the container only has access to a few required domains. Created a script using iptables for this. Thought I would share it if someone needs it 🙌
I've seen similar discussions: #323
See the script and readme for more details!

1. Repo: https://github.com/JoAMD/transmission-openvpn-firewall/tree/main
2. setup_container_firewall_template.sh
3. docker-compose.yml

References used:

1. ChatGPT & Copilot
2. https://linux.die.net/man/8/iptables
3. https://linux.die.net/man/1/dig
4. https://github.com/Zomboided/service.vpn.manager.providers/tree/master