enables board for UnifiedPush

[Meiwan]

Unified push is a self-hosted service with many free publicly hosted servers that enables Android to receive notification without relying on Google services. It is very popular with privacy focused, de-Googled roms (like GrapheneOS, LineageOS, or just first party Android, with Google services deleted), and since a lot of your user base is privacy conscious, many of them are probably using such de-Googled roms, like I do. 

So it would make so much sense to add support for unified push.

[Jon]

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