Forward deployment - addition of worker to drop old deployments

Merged Etienne Baqué requested to merge 25276-allow-forward-deploys-only-with-worker into master

What does this MR do?

While another MR introduces the forward_deployment? method which checks whether a job should go ahead in deploying a deployment, this alternative MR here explores the possibility of doing the same by using a worker.

Screenshots

Does this MR meet the acceptance criteria?

Conformity

Availability and Testing

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

  • Label as security and @ mention @gitlab-com/gl-security/appsec
  • The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
  • Security reports checked/validated by a reviewer from the AppSec team

Closes #25276 (closed)

Edited by Etienne Baqué