try to keep deb name consistent

.github/workflows/build_and_release.yml

@@ -21,11 +21,14 @@ jobs:
       - name: Build Deb package
         run: nix build .#deb
 
+      - name: rename DEB
+        run: cp result/*.deb ./pvemon.deb
+
       - name: Upload DEB package to Release
         uses: svenstaro/upload-release-action@v2
         with:
           repo_token: ${{ secrets.REPO_PAT }}
-          file: result/*.deb
+          file: pvemon.deb
           asset_name: pvemon.deb
           tag: ${{ github.ref }}
           overwrite: true