Remove CAP_NET_ADMIN requirement and eliminate need for CAP_SYS_ADMIN on
modern kernels by using non-promiscuous mode for packet capture. This
significantly reduces security surface by following principle of least privilege.
- Add automated PPA build workflow for Ubuntu 22.04 and 24.04
- Build and sign packages using CI GPG key
- Auto-upload to ppa:domcyrus/rustnet on git tags
- Add complete Debian packaging files