This commit adds a new test that rebuilds kernel-ark with clang to
ensure that we do not break the upstream builds. This is a squashed
commit of the following:
PoC for kernel-ark build test and plan
kernel-ark: create virtual test and run all build configurations
Created configurations for lto/non-lto and base/debug, adding proper
relevancies. Test script parametrized with environment variables so it
can be reused by all these configs.
Fix relevancy for debug/non-lto build
Fix dependency install logic
Final cleanups
Make kernel-ark-build plan to be run only if triggered manually
Rename kernel-ark plan to avoid naming confusions with the test
Add documentation for kernel-ark test
