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build-docker-image: Fix application tag concurrent issue push

Antoine R. Dumont requested to merge ardumont/swh-jenkins-jobs:fix-tag-concurrent-issue into master

Currently, it can still happen that concurrent build is triggered and docker images for the same applications are built in parallel. This results in an infinite loop for one of the docker images. [1]

This tries to overcome that issue by writing early on in the pipeline an empty tag (with the next version to be built). That way, if concurrent issue arises, the next build should take the next version.

[1] Possible scenario is swh.core is tagged (or any other highly connected module like swh.storage) triggers the rebuild of the application swh.loader.git. In the mean time, swh.loader.git is itself tagged, then possibly the 2 images are built closely enough that one will get stuck trying to push the exact same tag.

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