[CI] Upload tune file

Author: giordano

.github/workflows/benchmark.yml

@@ -64,3 +64,8 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           SSH_KEY: ${{ secrets.DOCUMENTER_KEY }}
+      - uses: actions/upload-artifact@v4
+        with:
+          name: tune-json
+          path: |
+            **/tune.json