Use fn build with network_mode=host

[crnitu]

Hi,
I cannot find any examples or any documentation on how to use fn build command using the network=host mode like it's possible with docker. Does this functionality exists and if so how can I enable it (an example would be perfect)?
The reason behind it is that I have limitation in enabling IPv4 forwarding flag on the server where I run the fn build command hence this is the only option.

Thank you,