Merge branch 'amazonec2-credit-specification' into 'main'

AWS Credit Specification support

See merge request https://gitlab.com/gitlab-org/ci-cd/docker-machine/-/merge_requests/118



Merged-by: Axel von Bertoldi <avonbertoldi@gitlab.com>
Approved-by: Axel von Bertoldi <avonbertoldi@gitlab.com>
Reviewed-by: Ruben <328418-RubenNL@users.noreply.gitlab.com>
Reviewed-by: Axel von Bertoldi <avonbertoldi@gitlab.com>
Co-authored-by: Ruben <ruben@rubend.nl>