isContainerCgroup() for linux doesn't work in certain scenarios

[pemarko]

Describe the bug
Running local kind cluster, when ecapture is executed inside ubuntu:22.04 container, it fails to start as it cannot find /boot/config-*
Problem is detection in isContainerCgroup() which reads single 1024 chunk of /proc/1/cgroups and looks for "cpuset:/" substring. However in my case, substring is at byte1612.

To Reproduce
Run ecapture inside container on local kind cluster.

Expected behavior
ecapture should detect that's running inside container and thus won't require /boot/config* file to be present.

[cfc4n]

Running ecapture in a container, file absence is not the main issue. There are also many problems related to the container's BPF execution permissions, library location, symbol table search, and so on. It is recommended that you use ecapture inside the host machine.

ref: #65

[cfc4n]

ping?