Allow skopeo inspect to check for images for any arch

When '--raw' option was not given in inspect, skopeo tries to look
for manifest of amd64 arch, but some images are built for other
arches only, hence skopeo inspect was failing

iib/workers/tasks/build.py

@@ -814,7 +814,7 @@ def inspect_related_images(bundles: List[str], request_id) -> None:
             for related_image in bundle_metadata['found_pullspecs']:
                 related_image_pull_spec = related_image.to_str()
                 try:
-                    skopeo_inspect(f"docker://{related_image_pull_spec}")
+                    skopeo_inspect(f'docker://{related_image_pull_spec}', '--raw')
                 except IIBError as e:
                     log.error(e)
                     invalid_related_images.append(related_image_pull_spec)

tests/test_workers/test_tasks/test_build.py

@@ -1376,6 +1376,7 @@ def test_inspect_related_images(mock_gil, mock_cffi, mock_fd, mock_gbd, mock_si,
     build.inspect_related_images(bundles=bundles, request_id=request_id)
 
     assert mock_si.call_count == 5
+    mock_si.assert_any_call('docker://quay.io/related/image@sha256:5', '--raw')
     assert mock_gbd.call_count == 2
     assert mock_gil.call_args_list == [
         mock.call(