Revert "Use tar internal option"

This reverts commit 73cbfe4.

Author: vmcj

.github/workflows/autoconf-check.yml

@@ -19,7 +19,8 @@ jobs:
           make dist
           cd ..
           mv domjudge release
-          tar -czvf release.tar.gz release
+          tar -cf release.tar release
+          gzip -i release.tar
       - name: Upload Artifact
         uses: actions/upload-artifact@v4
         with: