[FEATURE] Test with kernel eBPF test.

[yunwei37]

Is your feature request related to a problem? Please describe.

The unit test for bpftime is insufficient now. can we test bpftime with kernel eBPF test, since it's compatible with kernel eBPF?

Describe the solution you'd like

use https://elixir.bootlin.com/linux/latest/source/tools/testing/selftests/bpf for test. build a ci and test them in it.

Describe alternatives you've considered

Provide usage examples

Additional context

[Zheaoli]

I think this could be included in a nightly CI