[Feature request]: It would be great to connect two or more repositories for OTA images

[ptvoinfo]

Is your feature request related to a problem? Please describe

It would be great to connect two or more repositories for OTA images. For example, one public repository for brand devices and one repository for DIY devices.

Describe the solution you'd like

Maybe, we can change the "zigbee_ota_override_index_location" configuration option to accepts an array of index files.

Describe alternatives you've considered

Or we can some kind of "include" to json file. In this case, the overridden json file may have links to multiple repositories (local or remote).

Additional context

n/a