feat: new configuration system (and schema) (#2819)

config/initializers/secret_key.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
-if Postal.config.rails&.secret_key
-  Rails.application.secrets.secret_key_base = Postal.config.rails.secret_key
+if Postal::Config.rails.secret_key
+  Rails.application.secrets.secret_key_base = Postal::Config.rails.secret_key
 else
   warn "No secret key was specified in the Postal config file. Using one for just this session"
   Rails.application.secrets.secret_key_base = SecureRandom.hex(128)

config/initializers/sentry.rb

@@ -2,8 +2,8 @@
 
 require "postal/config"
 
-if Postal.config.general&.exception_url
+if Postal::Config.logging.sentry_dsn
   Sentry.init do |config|
-    config.dsn = Postal.config.general.exception_url
+    config.dsn = Postal::Config.logging.sentry_dsn
   end
 end

config/initializers/smtp.rb

@@ -2,9 +2,10 @@
 
 require "postal/config"
 
-if Postal.config&.smtp
-  # TODO: by default, we should just send mail through the local Postal
-  # installation rather than having to actually configure an SMTP server.
-  ActionMailer::Base.delivery_method = :smtp
-  ActionMailer::Base.smtp_settings = { address: Postal.config.smtp.host, user_name: Postal.config.smtp.username, password: Postal.config.smtp.password, port: Postal.config.smtp.port || 25 }
-end
+ActionMailer::Base.delivery_method = :smtp
+ActionMailer::Base.smtp_settings = {
+  address: Postal::Config.smtp.host,
+  user_name: Postal::Config.smtp.username,
+  password: Postal::Config.smtp.password,
+  port: Postal::Config.smtp.port
+}