Test that all the supported program types can be loaded and attached as part of CI

[alessandrod]

As part of CI, we should test that we can load and attach all the supported programs. This requires doing two things:

• we need to create small test programs for all the supported types (using aya-bpf and building with bpf-linker)
• we need to create a github action workflow that somehow - probably using qemu or maybe even multipass - loads our own kernel where we can use the bpf syscall (which is otherwise not available in github runners)

[willfindlay]

I've been using vagrant for this on a macOS host (only host that supports nested virtualization). Works quite well, though build times are a bit slow.

For reference:

• https://github.com/willfindlay/bpfcontain-rs/blob/master/.github/workflows/ci.yml
• https://github.com/willfindlay/bpfcontain-rs/blob/master/Vagrantfile