ci: auto delete untagged pkgs

Author: Itsusinn

.github/workflows/pre-release.yml

@@ -247,3 +247,10 @@ jobs:
           platforms: linux/amd64,linux/arm64
           push: true
           tags: ghcr.io/${{ steps.get-ownername.outputs.OWNER }}/tuic-server:latest
+
+      - name: Delete all images from package without tags
+        uses: Chizkiyahu/delete-untagged-ghcr-action@v3
+        with:
+          token: ${{ github.token }}
+          untagged_only: true
+          owner_type: user