Compression on a tarball doesn't help (and slows us)

Author: vmcj

.github/workflows/autoconf-check.yml

@@ -25,6 +25,7 @@ jobs:
       - name: Upload Artifact
         uses: actions/upload-artifact@v4
         with:
+          compression-level: 0
           name: test-tarball
           path: /__w/domjudge/release.tar.gz