feat: setup galera cluster member profile

- add eyaml support for role
- add /data volume for galera cluster members
- create profiles::selinux namespace for defining selinux configuration
  - create profiles::selinux::mysqld for managing specifics for mysqld
  - create profiles::selinux::setenforce to manage selinux mode
- parameterised options required in mysqld::server module
- add mariadb repo
- add additional facts for managing mysqld and galera

site/profiles/lib/facter/mariadb_active.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+# create a boolean for when the mariadb service is active
+require 'English'
+
+Facter.add('mariadb_active') do
+  setcode do
+    system('systemctl is-active --quiet mariadb')
+    $CHILD_STATUS.exitstatus.zero?
+  end
+end

site/profiles/lib/facter/mariadb_datapath.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+# check if the /etc/my.cnf.d/server.cnf file exists,
+# open it and search for the 'datadir =' option
+# store the datadir value as this fact
+require 'facter'
+
+Facter.add('mariadb_datapath') do
+  setcode do
+    if File.exist?('/etc/my.cnf.d/server.cnf')
+      datadir = nil
+      File.foreach('/etc/my.cnf.d/server.cnf') do |line|
+        match = line.match(/^\s*datadir\s*=\s*(.+)\s*$/)
+        if match
+          datadir = match[1].strip
+          break
+        end
+      end
+      datadir
+    end
+  end
+end

site/profiles/lib/facter/mariadb_galera_active.rb

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+# check if the mariadb server exists
+# check if the mariadb_datapath fact exists, else set /var/lib/mysql as the datapath
+# check if the galera grastate.dat file exists, identifying if galera is boostrapped
+require 'facter'
+
+if system('systemctl is-active --quiet mariadb')
+
+  Facter.add('mariadb_galera_active') do
+    setcode do
+      mariadb_datapath = Facter.value(:mariadb_datapath) || '/var/lib/mysql'
+      File.exist?("#{mariadb_datapath}/grastate.dat")
+    end
+  end
+end

site/profiles/lib/facter/mariadb_installed.rb

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+# create boolean for if mariadb is installed based of the default service file
+Facter.add('mariadb_installed') do
+  setcode do
+    File.exist?('/usr/lib/systemd/system/mariadb.service')
+  end
+end