New track for `opendkim` charm

[javierdelapuente (Javier de la Puente Alonso)]

Hello, can you please create the new track 2 for opendkim and set it as default?

Thanks!

[adityagoel28 (Aditya Goel)]

Hi @javierdelapuente ,

I have created the track and set it as default.

Thanks,
Aditya