Added user_cap column to namespace_settings

Changelog: added

db/migrate/20210705132928_add_new_user_signups_cap_to_namespace_settings.rb

+# frozen_string_literal: true
+
+class AddNewUserSignupsCapToNamespaceSettings < ActiveRecord::Migration[6.1]
+  include Gitlab::Database::MigrationHelpers
+
+  def up
+    with_lock_retries do
+      add_column :namespace_settings, :new_user_signups_cap, :integer, null: true
+    end
+  end
+
+  def down
+    with_lock_retries do
+      remove_column :namespace_settings, :new_user_signups_cap
+    end
+  end
+end

db/schema_migrations/20210705132928

+c66a42fc813846a09d4389a895a2d20ad48889d8ff45ab642e771b6792490623
\ No newline at end of file

db/structure.sql

@@ -15103,6 +15103,7 @@ CREATE TABLE namespace_settings (
     resource_access_token_creation_allowed boolean DEFAULT true NOT NULL,
     lock_delayed_project_removal boolean DEFAULT false NOT NULL,
     prevent_sharing_groups_outside_hierarchy boolean DEFAULT false NOT NULL,
+    new_user_signups_cap integer,
     CONSTRAINT check_0ba93c78c7 CHECK ((char_length(default_branch_name) <= 255))
 );