new(ci): add a zig build job plus a composite action to setup zig.

[FedeDP]

What type of PR is this?

/kind feature

Any specific area of the project related to this PR?

/area CI

Does this PR require a change in the driver versions?

What this PR does / why we need it:

This PR adds a composite action to setup zig (stolen by my Falco PR: falcosecurity/falco#3307, that will be of course updated to use the libs provided action once this gets merged), and adds a CI job to test build of sinsp-example with zig.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: FedeDP

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[FedeDP]

We need to use a development version of zig since it needs my patch: ziglang/zig#21253
Hopefully they'll release 0.14.0 soon.

Also, keeping this PR wip as master zig artifacts are not kept around, ie: once a new master artifact is released, the old ones get removed.

[FedeDP]

As a workaround, i am using actions/cache to cache the zig toolchain.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.58%. Comparing base (b8c2d0d) to head (0b6cc6a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2078   +/-   ##
=======================================
  Coverage   73.58%   73.58%           
=======================================
  Files         253      253           
  Lines       31867    31867           
  Branches     5640     5627   -13     
=======================================
  Hits        23449    23449           
+ Misses       8414     8403   -11     
- Partials        4       15   +11     

Flag	Coverage Δ
libsinsp	73.58% <ø> (ø)

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[github-actions]

Perf diff from master - unit tests

     1.90%     +1.16%  [.] sinsp_thread_manager::find_thread
     1.27%     +0.94%  [.] std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release
    10.70%     +0.61%  [.] sinsp_parser::reset
     1.32%     -0.60%  [.] sinsp_filter_check::parse_field_name
     7.66%     +0.59%  [.] sinsp::next
     2.47%     -0.57%  [.] scap_event_decode_params
     0.63%     -0.53%  [.] sinsp_evt::is_filtered_out
     0.52%     +0.48%  [.] scap_event_has_large_payload
     3.48%     -0.43%  [.] sinsp_thread_manager::get_thread_ref
     4.59%     -0.40%  [.] sinsp_evt::load_params

Heap diff from master - unit tests

peak heap memory consumption: 0B
peak RSS (including heaptrack overhead): 0B
total memory leaked: 0B

Heap diff from master - scap file

peak heap memory consumption: 0B
peak RSS (including heaptrack overhead): 0B
total memory leaked: 0B

Benchmarks diff from master

Comparing gbench_data.json to /root/actions-runner/_work/libs/libs/build/gbench_data.json
Benchmark                                                         Time             CPU      Time Old      Time New       CPU Old       CPU New
----------------------------------------------------------------------------------------------------------------------------------------------
BM_sinsp_split_mean                                            +0.0096         +0.0096           151           152           151           152
BM_sinsp_split_median                                          +0.0088         +0.0088           151           152           151           152
BM_sinsp_split_stddev                                          +1.0427         +1.0423             1             2             1             2
BM_sinsp_split_cv                                              +1.0233         +1.0229             0             0             0             0
BM_sinsp_concatenate_paths_relative_path_mean                  +0.1291         +0.1291            41            46            41            46
BM_sinsp_concatenate_paths_relative_path_median                +0.1314         +0.1314            41            46            41            46
BM_sinsp_concatenate_paths_relative_path_stddev                +2.7327         +2.7301             0             1             0             1
BM_sinsp_concatenate_paths_relative_path_cv                    +2.3060         +2.3036             0             0             0             0
BM_sinsp_concatenate_paths_empty_path_mean                     +0.0093         +0.0093            17            17            17            17
BM_sinsp_concatenate_paths_empty_path_median                   +0.0137         +0.0137            17            17            17            17
BM_sinsp_concatenate_paths_empty_path_stddev                   -0.5007         -0.5012             0             0             0             0
BM_sinsp_concatenate_paths_empty_path_cv                       -0.5053         -0.5058             0             0             0             0
BM_sinsp_concatenate_paths_absolute_path_mean                  +0.1100         +0.1100            45            50            45            50
BM_sinsp_concatenate_paths_absolute_path_median                +0.1250         +0.1250            45            51            45            51
BM_sinsp_concatenate_paths_absolute_path_stddev                +0.5418         +0.5422             1             2             1             2
BM_sinsp_concatenate_paths_absolute_path_cv                    +0.3891         +0.3894             0             0             0             0
BM_sinsp_split_container_image_mean                            -0.0243         -0.0243           350           341           350           341
BM_sinsp_split_container_image_median                          -0.0245         -0.0245           350           341           350           341
BM_sinsp_split_container_image_stddev                          -0.1835         -0.1844             2             1             2             1
BM_sinsp_split_container_image_cv                              -0.1632         -0.1641             0             0             0             0

[FedeDP]

/milestone 0.19.0