feat: mysql wsrep_ facts

- add facts generated from mysql's wsrep status variables

site/profiles/lib/facter/mysql_wsrep.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+# skip if mysql isnt installed or active
+next unless system('which mysql > /dev/null 2>&1')
+next unless system('systemctl is-active --quiet mariadb')
+
+# export mysql wsrep status
+wsrep_status = `mysql -e "SHOW STATUS LIKE 'wsrep%';"`
+
+# loop over the output
+wsrep_status.each_line do |line|
+  # skip the line unless it starts with 'wsrep_'
+  next unless line.match(/^wsrep_/)
+
+  key, value = line.split("\t")
+  Facter.add("mysql_#{key.strip}") do
+    setcode do
+      value.strip
+    end
+  end
+end