[$] An update on continuous testing of BPF kernel patches

Ihor Solodrai has been working on the BPF subsystem's continuous-integration
(CI) testing for the last six months. At the 2025 Linux Storage, Filesystem,
Memory-Management, and BPF Summit, he remotely shared
an update on his work, and solicited feedback on how the tests could be further
improved. Much of the work he's done has been specific to the BPF subsystem, but
some is more generic and could potentially be of use to other subsystems. He
also shared some general lessons learned from working on the BPF CI tests.