How to use the rpki.net Ubuntu APT repository

How to use this APT repository:

These packages are regenerated automatically by a cron job running a pbuilder environment. Please report any problems.

Name                    Last modified      Size  Description
Parent Directory - rpki.xenial.list 2016-03-24 05:00 112 pool/ 2016-03-18 20:19 - dists/ 2018-06-17 18:30 - apt-gpg-key.gpg 2017-04-18 23:36 1.5K apt-gpg-key.asc 2013-03-09 19:53 2.1K
Apache/2.4.62 (FreeBSD) OpenSSL/3.0.15 SVN/1.14.4 Server at download.rpki.net Port 80