Add support for Personal Package Archive (PPA) installation of Lodestar

**Describe the solution you'd like**

Current available installation methods require downloading and installing packages from github or docker, but these installation methods require significant effort on behalf of the user. Ethereum maintains a PPA and geth is currently most-easily installed using this method. If other clients adopt the PPA installation method it will significantly reduce the effort required to install a Consensus client and enable people with limited technical ability to quickly and easily upgrade their consensus client using standard apt repositories.