This is not quite the issue. It is good that platformsToBuild is a list of platforms to build but not necessarily to push.

I think the problem is here where it says:

	// we only will push if one of these is true:
	// - we had at least one platform to build
	// - we found an image in local cache
	// if neither is true, there is nothing to push
	if len(platformsToBuild) == 0 && !imageInLocalCache {
		fmt.Fprintf(writer, "No new platforms to push, skipping.\n")
		return nil
	}

It looks like imageInLocalCache is not set correctly. In the case where we called pkg push and there was nothing to build, because it was all in local cache, then it should find them in local cache. So imageInLocalCache should be true, but it looks like it was not.

So we just want to go into c.ImageInCache branch. Modified

Makes sense. It should be easy enough to test. Did you try?

Makes sense. It should be easy enough to test. Did you try?

Not yet, no enough bandwidth on my PC. Will try and remove draft if it will work

It works, at least I can see UNAUTHORIZED: authentication required after update (and build) of one package