chore(ci): New layout of the CI

[owulveryck]

This is a complete rewrite of the CI factory.

Workflows

There are now three workflows corresponding to the different OS of the runners:

• Build and Tests on Linux/amd64
• Build and Tests on MacOS/amd64
• Build and Tests on Self-Hosted (arm)

Jobs

Each workflow is composed of two jobs:

• stable-go
• previous-go

Both jobs are identical besides the go version they are executing. The reason to avoid the matrix strategy is that GitHub appends the matrix tags to each of the running jobs. As a consequence, changing the version of Go implies modifying the protection policy of the project.

Caching

Each job is trying to use the cache mechanism to lower the time passed in the CI.

Steps

The jobs are:

• Building the code for the current platform
• cross-compiling the code for any other platform
• Launching some tests with the race condition

A matrix strategy is only present to tests the build tags (as it was before). A special tag "none" is present. If tag is none, the -tag is omitted.

README

With this build process, I think it is safe to use the badge of the Linux runner on the README. It performs all the tests on Linux and validates that the code is compilable on all the platforms.

TODO

Once this PR is validated, the protection of the master branch needs to be tweaked to request the validation of:

• Build and Tests on Linux/amd64 / Build and test on latest stable Go release (none)
• Build and Tests on Linux/amd64 / Build and test on latest stable Go release (avx) if mandatory
• Build and Tests on Linux/amd64 / Build and test on latest stable Go release (see) if mandatory
• ...:

Maintenance

When a new Go version is dropped, there is a need to modify the three workflows

Optimization

The code is heavily repeated (DRY they said). If this system is ok for us, it could be good to write a small tool (based on templates), to automate all the stuff when a new Go version is dropped.

[owulveryck]

I forgot to add the coverage in the CI.
I will do that soon

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@c8283ea). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #473   +/-   ##
=========================================
  Coverage          ?   55.41%           
=========================================
  Files             ?       71           
  Lines             ?    11597           
  Branches          ?        0           
=========================================
  Hits              ?     6426           
  Misses            ?     4324           
  Partials          ?      847           

Flag	Coverage Δ
unittests	55.41% <0.00%> (?)

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[owulveryck]

Good to merge if the review is ok.

[chewxy]

let's make AVX and SSE2 mandatory

[owulveryck]

Can I merge? (and take care of the settings of the project to make things mandatory)