Another issue reminded me that that OWS has with fdroid is that, by default, the APKs are signed by the buildserver rather than the developers. F-droid has a means to allow the developer to sign if the builds are byte for byte deterministic and repeatable:

https://f-droid.org/wiki/page/Deterministic,_Reproducible_Builds

Just creating this issue to track any efforts there, as that might make the OWS team more amenable to allow fdroid builds

Here's an example of an app built deterministically:
https://github.com/guardianproject/lildebi#build-setup