[aquariusDue]

Also it works with private repos too if you provide a personal access token (fine-grained) in the Obtainium app settings. Just make sure to "release" (on the Releases tab) the .apk file on the GitHub repo and tag it latest.

I use 'just' (command runner) and the 'gh' CLI to automate this:

    # Build and publish a GitHub release
    release: apk
        VERSION="v$(date +'%Y.%m.%d')-$(git rev-parse --short HEAD)"; \
        APK="build/app/outputs/flutter-apk/app-release.apk"; \
        REPO="$(git config --get remote.origin.url | sed -E 's#.*github.com[:/](.*)\.git#\1#')"; \
        echo "Releasing $VERSION to $REPO"; \
        git tag "$VERSION" 2>/dev/null || true; \
        git push origin "$VERSION"; \
        gh release create "$VERSION" "$APK" \
            --repo "$REPO" \
            --title "$VERSION" \
            --notes "Automated release for $VERSION" \
        || gh release upload "$VERSION" "$APK" --repo "$REPO" --clobber