Improving eBPF generator Docker image

[mariomac]

With this image, we don't need anymore to ship all the "bpf_helpers.h" etc... include files in our bpf source code, as it already ships the official BPF library.

I tested it in another project with the following headers:

#include <linux/bpf.h>
#include <linux/if_ether.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/udp.h>

#include <bpf/bpf_endian.h>
#include <bpf/bpf_helpers.h>

The code compiled perfectly without requiring to bundle any library in the bpf/headers folder.

However in Beyla it wouldn't be so direct, as we still need to ship our own copy of "vmlinux.h", because the /usr/include/aarch64-linux-gnu/linux/vmlinux.h copy inside the container seems to be incomplete.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.97%. Comparing base (f517939) to head (1fefac3).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1428      +/-   ##
==========================================
- Coverage   81.02%   80.97%   -0.06%     
==========================================
  Files         147      147              
  Lines       15033    15033              
==========================================
- Hits        12181    12173       -8     
- Misses       2260     2267       +7     
- Partials      592      593       +1     

Flag	Coverage Δ
integration-test	59.18% <ø> (-0.03%)	⬇️
k8s-integration-test	59.53% <ø> (+0.01%)	⬆️
oats-test	33.70% <ø> (-0.05%)	⬇️
unittests	51.60% <ø> (ø)

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[grcevski]

LGTM!