Preserve the tag of the pulled image's name

When we pull an image, preserve the tag portion of the name that we were
asked to use for pulling it, instead of unconditionally replacing it
with "latest".

Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>

pkg/storage/image.go

@@ -2,6 +2,7 @@ package storage
 
 import (
 	"github.com/containers/image/copy"
+	"github.com/containers/image/docker/reference"
 	"github.com/containers/image/signature"
 	istorage "github.com/containers/image/storage"
 	"github.com/containers/image/transports/alltransports"
@@ -132,6 +133,9 @@ func (svc *imageService) PullImage(systemContext *types.SystemContext, imageName
 	dest := imageName
 	if srcRef.DockerReference() != nil {
 		dest = srcRef.DockerReference().Name()
+		if tagged, ok := srcRef.DockerReference().(reference.NamedTagged); ok {
+			dest = dest + ":" + tagged.Tag()
+		}
 	}
 	destRef, err := istorage.Transport.ParseStoreReference(svc.store, dest)
 	if err != nil {