[Task] Create an action to set custom workflow status

[shiipou]

What should be done

This must allow us to define pending state in a workflow without the need to run the full workflow at each Pr update.

[taorepoara]

@shiipou Can you explain it better ?

[shiipou]

@shiipou Can you explain it better ?

For example, in our existing CI in the pr-is-wip action, we set a custom status on the CI :

This status is in pending, and it will be executed everytime we change something in the PR (code, title, comments, etc...)
But the code check is also on this same event, we can change the event to on: push and check if all current PR's CI state is to success (in green) before building it. Else we just skip the event.