Add signatures for Saber

Required

• The app complies with the inclusion criteria
• All related fdroiddata and RFP issues have been referenced in this merge request
• Builds with fdroid build

Strongly Recommended

• The upstream app source code repo contains the app metadata (summary/description/images/changelog/etc) in a Fastlane or Triple-T folder structure
• Releases are tagged

Suggested

• External repos are added as git submodules instead of srclibs
• Multiple apks for native code

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Reason

I've followed the steps from https://f-droid.org/en/docs/Reproducible_Builds/ for F-Droid to publish both (upstream) developer-signed and F-Droid-signed APKs.

Is there a way to automatically run this command when there's an update?

fdroid signatures https://github.com/adil192/saber/releases/latest/download/Saber.apk