feat: add debian12 scripts

- nftables_is_enabled.sh 	-> 4.2.9
- nftables_has_table.sh 	-> 4.2.4
- nftables_has_base_chains.sh 	-> 4.2.5
- nftables_rules_permanent.sh	-> 4.2.10

tests/hardening/nftables_has_base_chains.sh

@@ -0,0 +1,15 @@
+# shellcheck shell=bash
+# run-shellcheck
+test_audit() {
+    describe Prepare test
+    apt install -y nftables
+
+    # running on a non privilieged container, wont test much...
+    describe Running on blank host
+    register_test retvalshouldbe 1
+    # shellcheck disable=2154
+    run blank "${CIS_CHECKS_DIR}/${script}.sh" --audit-all
+
+    describe clean test
+    apt remove -y nftables
+}