On some systems, interface number 2 is not always the correct one.
With AWK we now collect the first active interface having both an
address and a broadcast.
# Summary of Changes
## Bugfixes 🐛
* Add `py3-pip` (Alpine apk package for Python3 Pip). The absence of this APK dependency will cause the container build to fail.
* Add a step to create an empty file at `/root/dist/empty.conf`, this ensures subsequent steps to cleanup don't cause the container build to fail.
## Improvements ✨
* Invoke `make` with `-j $(nproc)`. This forces `make` to spread the build process out over the number of logical cores available to the `make` process, significantly decreasing build times on multi-core systems.
