Add nftables tag to clickhouse role nftables section

Author: LDiazN

ansible/roles/oonidata_clickhouse/tasks/main.yml

@@ -36,3 +36,5 @@
         rules: "{{ zk_nft_rule }}"
       - name: 9234
         rules: "{{ raft_nft_rule }}"
+  tags:
+     - nftables