Add check for CONFIG_CGROUP_BPF in check-config.sh

[fmoessbauer]

The kernel config option CONFIG_CGROUP_BPF=y is required to be able to inject the BPF program of type BPF_PROG_TYPE_CGROUP_DEVICE.

If this option is not set, no containers can be started with runc (BTW: the same holds for crun).

Currently, the check-config.sh script does not test for this option, leading to all-green results for kernels where runc fails to start a container.

[kolyshkin]

@fmoessbauer thanks for reporting, feel free to open a PR!

[dharmicksai]

Hello, I would like to take up this issue is it okay if I create the pr?

[fmoessbauer]

Hello, I would like to take up this issue is it okay if I create the pr?

Sure. Thanks for taking over.