Disable touching individual DB migration files in production

We shouldn't be migrating the individual DB files in production
mode. These files should be already created in development/test mode,
and the user may not have permission to update these files during a
`db:schema:dump` Rake task.

lib/gitlab/database/postgresql_adapter/dump_schema_versions_mixin.rb

@@ -7,7 +7,7 @@ module Gitlab
         extend ActiveSupport::Concern
 
         def dump_schema_information # :nodoc:
-          Gitlab::Database::SchemaMigrations.touch_all(self)
+          Gitlab::Database::SchemaMigrations.touch_all(self) if Gitlab.dev_or_test_env?
 
           nil
         end

spec/lib/gitlab/database/postgresql_adapter/dump_schema_versions_mixin_spec.rb

@@ -26,4 +26,12 @@ RSpec.describe Gitlab::Database::PostgresqlAdapter::DumpSchemaVersionsMixin do
 
     instance.dump_schema_information
   end
+
+  it 'does not call touch_all in production' do
+    allow(Rails).to receive(:env).and_return(ActiveSupport::StringInquirer.new('production'))
+
+    expect(Gitlab::Database::SchemaMigrations).not_to receive(:touch_all)
+
+    instance.dump_schema_information
+  end
 end