Include images info in composeinfo.json

This change requires https://github.com/release-engineering/productmd/pull/150

JIRA: RHELCMP-2296
Signed-off-by: Haibo Lin <hlin@redhat.com>

pungi/metadata.py

@@ -156,6 +156,13 @@ def compose_to_composeinfo(compose):
                 var.paths.isos[arch] = relative_path(
                     iso_dir, compose.paths.compose.topdir().rstrip("/") + "/"
                 ).rstrip("/")
+            image_dir = compose.paths.compose.image_dir(variant=variant) or ""
+            if image_dir:
+                image_dir = image_dir % {"arch": arch}
+                if os.path.isdir(image_dir):
+                    var.paths.images[arch] = relative_path(
+                        image_dir, compose.paths.compose.topdir().rstrip("/") + "/"
+                    ).rstrip("/")
             jigdo_dir = (
                 compose.paths.compose.jigdo_dir(
                     arch=arch, variant=variant, create_dir=False