Add support for Fastlane, for f-droid

[holmesworcester]

According to an automated tool in the F-Droid submission process (https://gitlab.com/fdroid/rfp/-/issues/2289) we should use Fastlane, a tool for updating Android app descriptions and screenshots from the command line.

This seems like it could be generally useful to us beyond F-Droid, also.

• https://f-droid.org/docs/All_About_Descriptions_Graphics_and_Screenshots/#fastlane-structure
• https://docs.fastlane.tools/

[kowalski]

We have pipelines in github actions and integration with creating releasing in context of monorepo. Fastlane doesn't assume it's working in monorepo. This is probably going to be a lot of husstle to reconcile it.

[siepra]

Hey, I'm removing "good first issue" label as this task requires good knowledge of automation we use in the project. I'm also assigning myself as I've already started working on Fastlane implementation

[holmesworcester]

Will this work include "Set up Fastlane and Match to renew expiring certs & profiles on iOS–and Google Play"? Should I create a separate issue for that?