Update the libvirt use doc

Funningrequested to merge
FunningC0217/gitlab-runner:main into main

What does this MR do?

Update the libvirt use doc

  1. In some concurrent states, 30 seconds may not be sufficient.

  2. add the option for virtual machine UEFI boot.

  3. Using shutdown to turn off the VM on aarch64 may cause a null pointer access in the global list of shadow memory in kernel 6.6, leading to a kernel crash.

Why was this MR needed?

Libvirt runner can be used with ease of use and stability.

The instruction for VM shutdown seems to have fallen into a trap, as I couldn't find any patches related to the kernel community. I can only fix it in terms of usage.

After I changed shutdown to destroy and confirmed that the VM was really released. The issue of kernel crash did not occur.

What's the best way to test this MR?

do without

What are the relevant issue numbers?

about kernel crash: https://gitcode.com/openeuler/kernel/issues/6873

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