Getting a tags string from metadata-action

[joepio]

I've recently switched to using earthly, which now builds and also pushes the docker images.

With my earthly build, I can pass a --tags argument which is a single string that should contain all tags, e.g. latest,sha-12095h,v.0.31.2.

I'm trying to get such a string from ${{ steps.meta.outputs.tags }}", but I'm getting the full joepmeneer/atomic-server:sha-124124 thing instead of just sha-124124. Any ideas on how to do this?

I suppose in some way I was expecting outputs.tags to only include the tags, like tag1,tag2, but it does image:tag1,image:tag2

EDIT: I ended up changing what arguments I pass to include the full tags intead of only doing a comma-seperated final part.

EDIT 2: I think I'm having a massive brain-fart. I'm not sure where I got the idea that docker supports comma-seperated tags like that, but I suppose it's wrong!