I've searched around and can't find a real answer to this. If I create a docker git repo and set up autobuild to my dockerhub account, it will build with a single tag (i.e. latest, or 1.0 or foo) but I can't find any way to add a tag afterwards as you can via command line with a locally built docker image. Pulling down the image and then retagging doesn't work as the autobuild repos are read-only outside of the webui.
Being able to manually add a tag to an existing build would satisfy me for now, but being able to script in something to grab the correct tag version would be the best solution.
You can do this through the UI somewhat indirectly:
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