feat: add galera role

- add a base galera cluster member role
- include mysql and galera modules

Puppetfile

@@ -13,6 +13,7 @@ mod 'puppetlabs-puppetdb', '7.13.0'
 mod 'puppetlabs-postgresql', '9.1.0'
 mod 'puppetlabs-firewall', '6.0.0'
 mod 'puppetlabs-accounts', '8.1.0'
+mod 'puppetlabs-mysql', '15.0.0'
 
 # puppet
 mod 'puppet-python', '7.0.0'
@@ -29,6 +30,7 @@ mod 'puppet-prometheus', '13.4.0'
 mod 'ghoneycutt-puppet', '3.3.0'
 mod 'saz-sudo', '8.0.0'
 mod 'dalen-puppetdbquery', '3.0.1'
+mod 'markt-galera', '3.1.0'
 
 mod 'bind',
   :git => 'https://git.unkin.net/unkinben/puppet-bind.git',