Merge pull request cloudfoundry#1604 from akhinos/ignore-buildpack-update

[#172695119] Ignore updates of buildpack (e.g. second cf push)

Author: sethboyles

app/models/runtime/kpack_lifecycle_data_model.rb

@@ -38,8 +38,12 @@ def buildpacks
       []
     end
 
+    def buildpacks=(new_buildpacks) end
+
     def stack
       nil
     end
+
+    def stack=(new_value) end
   end
 end