Add betas to F-Droid

[532910]

• I have searched for existing issues that may be the same as or related to mine.

The F-Droid forum topic about this issue: https://forum.f-droid.org/t/orgzlry-betas/5517
F-Droid has the recommended tag, so unstable versions could be added while last stable will be recommend.

Discussion with @nevenz starts at the end of #453

[532910]

Project doesn't use Travis

As I understand it doesn't matters.

and for managing betas it sounds like CurrentVersionCode would have to be updated after every release?

Looks so.

[nevenz]

it sounds like CurrentVersionCode would have to be updated after every release?

I don't know if this is worth it. Betas are generally not betas for long. v1.7 was a special case due to tons of internal changes.