Move per-flavor fastlane metadata to top-level src/ folder

This is what's currently supported by FDroid, see https://gitlab.com/fdroid/fdroidserver/-/issues/829

Signed-off-by: Álvaro Brey <alvaro.brey@nextcloud.com>

scripts/buildDev

@@ -74,7 +74,7 @@ if git log --pretty='format:%an' HEAD "^$lastBuildTag" | grep -q dependabot; the
 fi
 
 # changelog
-echo "$changelog" > app/src/versionDev/fastlane/metadata/android/en-US/changelogs/$date.txt
+echo "$changelog" > src/versionDev/fastlane/metadata/android/en-US/changelogs/$date.txt
 
 git add .
 git commit -m "daily dev $date" -m "$changelog"

src/README.md

@@ -0,0 +1,2 @@
+This `src/` directory is only here for F-Droid, as it doesn't pick up per-flavor metadata in the app/ subdir.
+Tracking issue: https://gitlab.com/fdroid/fdroidserver/-/issues/829