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

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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 (5abb3db).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2078      +/-   ##
==========================================
- Coverage   73.58%   73.58%   -0.01%     
==========================================
  Files         253      253              
  Lines       31867    31867              
  Branches     5640     5641       +1     
==========================================
- Hits        23449    23448       -1     
+ Misses       8414     8410       -4     
- Partials        4        9       +5     

Flag	Coverage Δ
libsinsp	73.58% <ø> (-0.01%)	⬇️

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[github-actions]

Perf diff from master - unit tests

     1.92%     +1.41%  [.] sinsp_thread_manager::find_thread
     0.75%     +0.85%  [.] sinsp_evt::get_direction
     1.33%     -0.70%  [.] sinsp_filter_check::parse_field_name
     6.03%     -0.68%  [.] sinsp_evt::get_type
     4.38%     -0.67%  [.] sinsp_parser::process_event
     1.07%     +0.51%  [.] sinsp_parser::parse_context_switch
     0.91%     +0.50%  [.] sinsp_evt::get_param
     2.50%     -0.44%  [.] scap_event_decode_params
     4.17%     -0.41%  [.] gzfile_read
     1.29%     +0.39%  [.] std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release

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                                            -0.0203         -0.0203           151           148           151           148
BM_sinsp_split_median                                          -0.0193         -0.0193           151           148           151           148
BM_sinsp_split_stddev                                          -0.4004         -0.4008             1             0             1             0
BM_sinsp_split_cv                                              -0.3879         -0.3884             0             0             0             0
BM_sinsp_concatenate_paths_relative_path_mean                  +0.0330         +0.0330            41            42            41            42
BM_sinsp_concatenate_paths_relative_path_median                +0.0364         +0.0364            41            42            41            42
BM_sinsp_concatenate_paths_relative_path_stddev                +0.7860         +0.7848             0             0             0             0
BM_sinsp_concatenate_paths_relative_path_cv                    +0.7290         +0.7277             0             0             0             0
BM_sinsp_concatenate_paths_empty_path_mean                     -0.0103         -0.0103            17            17            17            17
BM_sinsp_concatenate_paths_empty_path_median                   -0.0036         -0.0036            17            17            17            17
BM_sinsp_concatenate_paths_empty_path_stddev                   -0.9098         -0.9100             0             0             0             0
BM_sinsp_concatenate_paths_empty_path_cv                       -0.9089         -0.9091             0             0             0             0
BM_sinsp_concatenate_paths_absolute_path_mean                  -0.0284         -0.0284            45            44            45            44
BM_sinsp_concatenate_paths_absolute_path_median                -0.0355         -0.0354            45            43            45            43
BM_sinsp_concatenate_paths_absolute_path_stddev                -0.4896         -0.4897             1             1             1             1
BM_sinsp_concatenate_paths_absolute_path_cv                    -0.4747         -0.4748             0             0             0             0
BM_sinsp_split_container_image_mean                            +0.0236         +0.0236           350           358           350           358
BM_sinsp_split_container_image_median                          +0.0238         +0.0238           350           358           350           358
BM_sinsp_split_container_image_stddev                          -0.3030         -0.3031             2             1             2             1
BM_sinsp_split_container_image_cv                              -0.3191         -0.3192             0             0             0             0

[FedeDP]

/milestone 0.19.0

[FedeDP]

To workaround some scarf-related issues, just skip using it while downloading text fixtures.