Add vault backend for gitlab-haproxy secrets

Marcel Chaconrequested to merge
mchacon-gstg-vault into master
  • Configuration for using Vault as the secrets backend for gitlab-haproxy secrets.
  • Added some unit testing for the vault backend.

Related Issue: https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/19125

Edited by Marcel Chacon

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