When building a devcontainer from dockerfile it will be useful to expose out additional docker build args that can be used when the container is created.
This can be done either by direct linking of these commands to the build property in the .devcontainer.json or via a catch-all array like build.command_flags: ["--network=host", "--compress"] etc

Example, a dockerfile is installing packages from an internal repository but your machine is on a vpn. Would need to pass --network=host to the build command to ensure that traversal happens correctly on Linux hosts.