add munin rules

manifests/rules/munin.pp

+# dispatch munin rules
+class firewall::rules::munin(
+  Array[Stdlib::IP::Address::V4] $munin_collector = [],
+  Array[Stdlib::IP::Address::V6] $munin_collector6 = [],
+  Stdlib::Port $munin_port = 4949,
+  Enum['loc','net'] $collector_source = 'net',
+){
+  include firewall
+  if $firewall::use_nftables {
+    if !empty($munin_collector) {
+      nftables::rule {
+        'default_in-munin-ipv4':
+          content => "ip saddr {${munin_collector.join(',')}} tcp dport ${munin_port} accept",
+      }
+    }
+    if !empty($munin_collector6) {
+      nftables::rule {
+        'default_in-munin-ipv6':
+          content => "ip6 saddr {${munin_collector6.join(',')}} tcp dport ${munin_port} accept",
+      }
+    }
+  } else {
+    class{'firewall::rules::munin':
+      munin_port       => $port,
+      munin_collector  => $munin_collector,
+      munin_collector6 => $munin_collector6,
+      collector_source => $collector_source,
+    }
+  }
+}