Merge pull request 'also upload aab' (#29) from fix/frontend/fastlane-config into main

Reviewed-on: #29

frontend/android/fastlane/Fastfile

@@ -21,6 +21,8 @@ platform :android do
       track: 'alpha',
       skip_upload_apk: true,
       skip_upload_changelogs: true,
+      aab: "build/app/outputs/bundle/release/app-release.aab",
+      # this is the default output of flutter build ... --release (in particular it is relative)
       )
   end
 
@@ -37,6 +39,8 @@ platform :android do
       track: "production",
       skip_upload_apk: true,
       skip_upload_changelogs: true,
+      aab: "build/app/outputs/bundle/release/app-release.aab",
+      # this is the default output of flutter build ... --release (in particular it is relative)
     )
   end
 end