Merge branch 'fix/cleanup_container' into 'master'

Remove manual installation of buildx as it's part of the base image already

See merge request https://gitlab.com/gitlab-org/terraform-images/-/merge_requests/233



Merged-by: Tiger Watson <twatson@gitlab.com>
Approved-by: Timo Furrer <tfurrer@gitlab.com>
Approved-by: Tiger Watson <twatson@gitlab.com>
Co-authored-by: Birger J. Nordølum <contact@mindtooth.no>