fix: devcontainer interface binding

[endrl]

Add interface binding to the config.

Tested

closes: #677
Requires: loco-rs/loco-devcontainer#1

[jondot]

@endrl thanks for this PR! also thanks for adjusting and updating the base_template, i'm happy you found it.
this change is hard to accept since NODE_BINDING is not a universal thing -- is there a different way to achieve what you're trying to solve?

[endrl]

Thank you for you fast response,
i tinkered a little bit and this is what i noticed in docker

# with interface localhost <-- broken port forward
 sudo netstat -tulpn | grep LISTEN
tcp        0      0 127.0.0.11:39899        0.0.0.0:*               LISTEN      -                   
tcp        0      0 127.0.0.1:45457         0.0.0.0:*               LISTEN      258/node            
tcp6       0      0 ::1:5150                :::*                    LISTEN      1572/target/debug/s 

# with interface 0.0.0.0 <-- works
sudo netstat -tulpn | grep LISTEN
tcp        0      0 0.0.0.0:5150            0.0.0.0:*               LISTEN      1772/target/debug/s 
tcp        0      0 127.0.0.11:46355        0.0.0.0:*               LISTEN      -                   
tcp        0      0 127.0.0.1:38659         0.0.0.0:*               LISTEN      258/node   

# with interface 127.0.0.1 <-- works
sudo netstat -tulpn | grep LISTEN
tcp        0      0 127.0.0.1:5150          0.0.0.0:*               LISTEN      1788/target/debug/s 
tcp        0      0 127.0.0.11:43631        0.0.0.0:*               LISTEN      -                   
tcp        0      0 127.0.0.1:44405         0.0.0.0:*               LISTEN      258/node 

A strange ipv6 bind is going on with localhost. I don't know why, especially there is no ipv6 network. The node port forward that devcontainer uses is a syscall to 127.0.0.1:PORT. But 127.0.0.1 is not reachable when loco binds to localhost

The vs code docs recommends to bind to 0.0.0.0.

Possible solutions

• Revert from localhost back to 0.0.0.0 and listen on all interfaces (universal)
• Change from localhost to 127.0.0.1
• Add a config option, so users can choose. So you can bind just to a specific ipX network for example.

I think the devcontainer setup should work out of the box, i was trapped because of the following config comment

 # Port on which the server will listen. the server binding is 0.0.0.0:{PORT}

This might be also a docker bug... If you look at the docs of appPort
Edit: Found docker/for-mac#7269

[jondot]

this is solved in upcoming version, we have a new BINDING env var.