docker-publish - authentification fail

Since release 8.0.5, docker publish authentication fails when source credentials aren't same as destination credentials.

before : merge_json src.json release.json > dest1.json

dest1.json contains release.json

after : merge_json release.json src.json > dest2.json

dest2.json contains src.json

So in https://gitlab.com/to-be-continuous/docker/-/blob/0f95fd7ce06d36aaa99f6e39f6848befbb52f09d/templates/gitlab-ci-docker.yml#L1437 source and destination credentials are same.