fix: define all groups in the firewall_additional_rules_for variable

fixed:
fatal: [10.172.0.22]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'dict object' has no attribute 'consul_instances'. 'dict object' has no attribute 'consul_instances'\n\nThe error appears to be in '/workspace/postgresql_cluster/add_pgnode.yml': line 93, column 7, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n    - name: Build a firewall_rules_dynamic_var\n      ^ here\n"}

vars/system.yml

@@ -164,7 +164,9 @@ firewall_additional_rules_for:
   master: []
   replica: []
   postgres_cluster: []
+  pgbackrest: []
   etcd_cluster: []
+  consul_instances: []
   balancers:
     - "iptables -p vrrp -A INPUT -j ACCEPT"  # Keepalived (vrrp)
     - "iptables -p vrrp -A OUTPUT -j ACCEPT"  # Keepalived (vrrp)