Ensure the manifest for the queried signature is in the queries repo.

[noissue]

pulp_container/app/registry_api.py

@@ -904,7 +904,7 @@ def get(self, request, path, pk):
         _, _, repository_version = self.get_drv_pull(path)
 
         try:
-            manifest = models.Manifest.objects.get(digest=pk)
+            manifest = models.Manifest.objects.get(digest=pk, pk__in=repository_version.content)
         except models.Manifest.DoesNotExist:
             raise ManifestNotFound(reference=pk)