add the tcmalloc unittests to our build system so that we can run them. I'm not sure if we want them as part of our main unittest tasks or a separate task - will leave that up to you guys.
add a build variant that runs our full test corpus with a 6.19+ kernel. For now it would only be used with patch builds and never automatically since we know it will be bright red on master. But once we merge a fix, I think we'd want recurring runs for a while to increase confidence. Also, for now it will be simplest to use an existing distro that we build+test on so that we don't need a separate build, but at some point we will almost certainly want to spin up an ubuntu 26.04 variant, so we can just turn this into that once it is ready.
Critical - P2 John Daniels