When using additional stores, report id only once

Currently if you setup additional stores and pull the same
image that exists in additionalstore, podman ends up reporting
the ID twice.

Fixes: containers/podman#18647

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

libimage/pull.go

@@ -442,8 +442,17 @@ func (r *Runtime) imagesIDsForManifest(manifestBytes []byte, sys *types.SystemCo
 	if err != nil {
 		return nil, fmt.Errorf("listing images by manifest digest: %w", err)
 	}
-	results := make([]string, 0, len(images))
+
+	// If you have additionStores defined and the same image stored in
+	// both storage and additional store, it can be output twice.
+	// Fixes github.com/containers/podman/issues/18647
+	results := []string{}
+	imageMap := map[string]bool{}
 	for _, image := range images {
+		if imageMap[image.ID] {
+			continue
+		}
+		imageMap[image.ID] = true
 		results = append(results, image.ID)
 	}
 	if len(results) == 0 {