Change artifacts name in Docker template to be compliant with metadata generation

Loic Nicollerequested to merge
docker_artifacts into main

part of: sylva-projects/sylva-core#1757 (closed)

To address: sylva-projects/sylva-core#1757 (closed) we want to set: RUNNER_GENERATE_ARTIFACTS_METADATA: true at group level. When we try to do it, it lead to error during the medatata generation for repo using our docker template. After some debug I found that it seem to be due to the custom name of theses artifacts.

Updating the template to use something simpler that work with metadata generation

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