Add --output appimage and zsync updater

Author: adil192

.github/workflows/linux.yml

@@ -135,6 +135,7 @@ jobs:
           cp -R usr/bin/share/* usr/share/
           rm -rf usr/bin/share
           echo "LD_LIBRARY_PATH=$(pwd)/usr/bin/lib:$LD_LIBRARY_PATH" >> $GITHUB_ENV
+          echo 'UPDATE_INFORMATION=gh-releases-zsync|saber-notes|saber|latest|Saber-*-x86_64.AppImage.zsync' >> $GITHUB_ENV
 
       - name: Install linuxdeploy
         working-directory: linux/AppImage
@@ -144,7 +145,7 @@ jobs:
       - name: Build AppImage
         working-directory: linux/AppImage
         run: |
-          ./linuxdeploy-x86_64.AppImage --appdir AppDir
+          ./linuxdeploy-x86_64.AppImage --appdir AppDir --output appimage
       
       - run: tree linux/AppImage