Pushing image stages with tags

[aerlaut]

Was looking at the documentation and saw

Was there a decision why tags are ignored for stages_image_name?

[whoan]

Was there a decision why tags are ignored for stages_image_name?

The decision was made based on these facts:

• For legacy behavior (no buildkit), the action does not know in advance how many stages are going to be crated, so it makes them up using -stages: . All we can do to have different tags per stage is to allow providing a custom prefix/suffix which I don't see that useful
• For buildkit, only one cache image is needed, so I used latest as that felt like a sensible default but it's true it could be anything else. Not sure why latest would be an issue though