feat: add debian12 scripts

- iptables_loopback.sh 			-> 4.3.2.2
- iptables_rules_them_all.sh 		-> 4.3.2.4
- iptables_outbound_established.sh 	-> 4.3.2.3
- ip6tables_loopback.sh			-> 4.3.3.2
- ip6tables_outbound_established.sh	-> 4.3.3.3
- ip6tables_rules_them_all.sh		-> 4.3.3.4
- ip6tables_default_deny_policy.sh 	-> 4.3.3.1

tests/hardening/iptables_rules_them_all.sh

@@ -0,0 +1,5 @@
+# shellcheck shell=bash
+# run-shellcheck
+test_audit() {
+    describe "This can't be tested without a privilieged container"
+}