Skip image push if tag exists

[ArzelaAscoIi]

We are using this action to build&push images with "plugins" like my-image:base-<pluginX>. For every CI run we want to publish these tags, but don't overwrite the old ones.

Currently we temporarly just set the bake target for this specific flavour and revert this in the CI, but ideally we would like to have something like skipIfExists:true within the action to not overwrite all other tags. Is there a smart way to achieve this with this action ?