Publish aar via JitPack

[ignoramous]

Jitpack is allowlisted by F-Droid, and so, OSS Android apps consuming c2pa can do so from there without having to worry about building a separate build workflow for just F-Droid (ref).

• via Gradle: https://docs.jitpack.io/android/
• via custom build: https://github.com/celzero/firestack/blob/32c8d7882de7a56ff8eda026bf7be596bcb87acc/jitpack.yml

[n8fr8]

Good idea!