The module installs `zmap` globally and links the config files to
`/etc/zmap`, the default location of config files for zmap.
The package provides pretty much a sensitive default, custom configs can
be created like this:
```
{ lib, ... }:
{
environment.etc."zmap/blacklist.conf" = lib.mkForce {
text = ''
# custom zmap blacklist
0.0.0.0/0
'';
};
}
```
