Add configuration to switch Departure database adapter version

Author: Austio

README.md

@@ -151,9 +151,18 @@ It's strongly recommended to name it after this gems name, such as
 
 All configuration options are configurable from the `Departure.configure` block example below
 
-|Option|Default|What it Controls|
-|---|---|---|
-|disable_rails_advisory_lock_patch|false|When truthy, disables a patch in at least rails 7.1 and 7.2 where rails throws ConcurrentMigrationErrors due to the inability to release the advisory lock in migrations|
+| Option                            | Default | What it Controls                                                                                                                                                          |
+|-----------------------------------|---------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| disable_rails_advisory_lock_patch | false   | When truthy, disables a patch in at least rails 7.1 and 7.2 where rails throws ConcurrentMigrationErrors due to the inability to release the advisory lock in migrations  |
+| db_adapter_name                   | nil     | 'mysql2' or 'percona' - gives users an ability to provide the specific db adapter to override the db_adapter we use in departure see Db Adapter Support Below for details |
+
+### Db Adapter Support
+
+Starting in Rails 8.1 we add support for the use of the trilogy database adapter gem.  Logic for selecting an adapter follows this logic
+
+1. Departure.configuration.db_adapter_name is set to 'mysql2' or 'trilogy' use that value
+2. If the database configuration specifies 'mysql2 or 'trilogy' use that adapter
+3. Default to mysql2
 
 ### Disable on per-migration basis
 

lib/departure/configuration.rb

@@ -1,14 +1,15 @@
 module Departure
   class Configuration
     attr_accessor :tmp_path, :global_percona_args, :enabled_by_default, :redirect_stderr,
-                  :disable_rails_advisory_lock_patch
+                  :disable_rails_advisory_lock_patch, :db_adapter_name
 
     def initialize
       @tmp_path = '.'.freeze
       @error_log_filename = 'departure_error.log'.freeze
       @global_percona_args = nil
       @enabled_by_default = true
       @redirect_stderr = true
+      @db_adapter_name = nil
     end
 
     def error_log_path

spec/departure/configuration_spec.rb

@@ -4,6 +4,12 @@
   describe '#initialize' do
     its(:tmp_path) { is_expected.to eq('.') }
     its(:error_log_filename) { is_expected.to eq('departure_error.log') }
+    its(:db_adapter_name) { is_expected.to be_nil }
+  end
+
+  describe '#db_adapter_name=' do
+    subject { described_class.new.tmp_path = 'trilogy' }
+    it { is_expected.to eq('trilogy') }
   end
 
   describe '#tmp_path' do