Problem overview

We started using githubs custom properties recently and noticed that our reviewdog/action-actionlint checks started to fail with the following error:

reviewdog: failed to build repo base HTML URL: json: cannot unmarshal array into Go struct field Repository.custom_properties of type string

The problem seems to originate in https://github.com/google/go-github where custom_properties is expected to be a map of string values when it actually can contain string arrays as well.

I've also created an issue at go-github (google/go-github#3229).