Add metadata for f-droid

This allows easier updates of screenshots and per-release changelogs.

See https://gitlab.com/snippets/1895688 for details.
Status Job ID Name Coverage
  Build
failed #123873
assembleDebug

failed #123874
assembleRelease

 
  Test
skipped #123875
debugTests
 
  Check
skipped #123876
lintDebug
 
Name Stage Failure
failed
assembleRelease Build There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job log
failed
assembleDebug Build There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job log