Add container suggestion for form actions + form-id

I would really like to see a container suggestion with the form id, so we could have something like:

container--form-actions--login.html.twig

Its already there for webforms (by $element['#webform_key']), but not for other forms.

I was not able to to make this work. Hopefully someone with more PHP skills can do this..
I've tried it using FormStateInterface .. but no luck.