Optional public ip config to add vito server to the firewall for created servers

[tobischulz]

This will add a optional variable in the core config file to add the vito public ip automatically to the firewall for each created server.

Add the PUBLIC_IP to the .env file with the public IP of your vito installation. If set, after a new server is installed this IP will be added to the firewall as 22/tcp to be able to connect to all your servers even when the default rule 22/tcp any is removed manually.

This would be optional and does not change anything if not used. But it is helpfull for users that like to remove the open 22/tcp rule without the need to manually add this ip every time for each server.

By using this it could also help to not lock out of your own servers.

[saeedvaziry]

Configs via env variables are not user friendly and I want to get rid of them.

This would be more practical feature after we implemented Vito Settings so admins can manage from dashboard.

For now lets just modify the rules after server creation.