[$] GitLab CI for the kernel

Working on the Linux kernel has always been unlike working onmany other software projects.One particularly noticeable difference is the decentralized nature of thekernel's testing infrastructure. Projects such assyzkaller, KernelCI,or the kernel self teststest the kernel in different ways. On February 28, HelenKoikeposted a patch set that would add continuous integration (CI) scripts forthe whole kernel. The response was generally positive, but several peoplesuggested changes.