Developer ID Installer: certificate not available in signing dropdown..?

I went to sign my DMG and in the settings clicked the dropdown menu.
I was expecting the see the Developer ID Installer certificate available but the only one I saw was my Developer ID Application, so I just used that one.

Why isn’t the Developer ID Installer available - I thought it would be more appropraite?

Also, I got an initial error:

unable to build chain to self-signed root for signer Developer ID Application

But, I looked at my keychain and changed Trust from Always Trust, to Use System Defaults and it worked.

Apple wants disk images to be signed with the Developer ID Application certificate, so DropDMG hides the others.

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