Add Terraform binary to renovate container image

Context

!792 (comment 1795195185)

What's in this MR?

We add the terraform binary to the container image, based on Terraform instructions.

Does it work?

Picking a container image that was generated for this MR in https://gitlab.com/gitlab-org/frontend/renovate-gitlab-bot/-/jobs/6288167354:

$ docker run registry.gitlab.com/gitlab-org/frontend/renovate-gitlab-bot/renovate-nodejs-18-ruby-3.0.4:ddieulivol-add-terraform-to-container-image terraform version
[...]

Terraform v1.7.4
on linux_amd64