add icinga2 rule for outgoing traffic

manifests/rules/out/icinga2.pp

@@ -0,0 +1,10 @@
+# allow outgoing icinga2
+# @param ports icinga2 ports
+class nftables::rules::out::icinga2 (
+  Array[Stdlib::Port,1] $ports = [5665],
+) {
+  nftables::rule {
+    'default_out-icinga2':
+      content => "tcp dport {${join($ports,', ')}} accept",
+  }
+}