Chore: Migration to enable email channel (#1913)

fixes: #1877

db/migrate/20210315101919_enable_email_channel.rb

@@ -0,0 +1,17 @@
+class EnableEmailChannel < ActiveRecord::Migration[6.0]
+  def change
+    current_config = InstallationConfig.where(name: 'ACCOUNT_LEVEL_FEATURE_DEFAULTS').last
+    current_config.value.each { |v| v['enabled'] = true if %w[inbound_emails channel_email].include?(v['name']) }
+    current_config.save!
+
+    ConfigLoader.new.process
+
+    Account.find_in_batches do |account_batch|
+      account_batch.each do |account|
+        account.enable_features('inbound_emails')
+        account.enable_features('channel_email')
+        account.save!
+      end
+    end
+  end
+end