postmarketos-config-nftables: add package for installing/configuring default fw
The reason for a new package with this name is so that the firewall 'implementation' can be changed and we don't have to create/destroy/replace packages to do that.
In this case, nftables is used, and some rules are included that:
drop all connections to wwan0 (more wwan names can be listed in this rule)...
allow ssh, drop from wwan (kinda redundant w/ the first rule, but doesn't hurt..)
fixes #1024 (closed)
depends on pmbootstrap!2042 (merged)