Use specific tags for each Docker image built

Each docker image built from a Worker version must have the following full image name & tag (instead of worker-version):

{repository.simplified_url}/{worker.slug}:{worker_version.id}

For example, for the given setup:

• repository https://gitlab.com/teklia/worker-ml.git
• worker balsac-line
• version 3ed81090-03d3-4725-935f-e6ebd9141e61

The tag should be: gitlab.com/teklia/worker-ml/balsac-line:3ed81090-03d3-4725-935f-e6ebd9141e61