added -stable to the version

.gitea/workflows/release.yml

@@ -28,7 +28,7 @@ jobs:
         run: |
           FLUTTER_VERSION=$(curl -s https://storage.googleapis.com/flutter_infra_release/releases/releases_linux.json | \
             jq -r '. as $root | $root.current_release.stable as $stable_hash | $root.releases[] | select(.hash == $stable_hash) | .version')
-          echo "FLUTTER_VERSION=$FLUTTER_VERSION" >> $GITHUB_ENV
+          echo "FLUTTER_VERSION=${FLUTTER_VERSION}-stable" >> $GITHUB_ENV
           echo "Latest Flutter version: $FLUTTER_VERSION"
 
       - name: Check if Docker image exists