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/manifests/selinux/setenforce.pp

@@ -0,0 +1,9 @@
+# profiles::selinux::setenforce
+class profiles::selinux::setenforce (
+  Enum['enforcing', 'permissive', 'disabled'] $mode = 'enforcing',
+) {
+  class { 'selinux':
+    mode => $mode,
+  }
+}
+