Fixes an issue where migrations instead of schema loading were run

If you called rake gitlab:db:drop_tables before running gitlab-ctl
reconfigure (or rake gitlab:db:configure)

changelogs/unreleased/db-configure-after-drop-tables.yml

+---
+title: Fixes an issue where migrations instead of schema loading were run
+merge_request: 20227
+author:
+type: changed

lib/tasks/gitlab/db.rake

@@ -46,7 +46,9 @@ namespace :gitlab do
 
     desc 'Configures the database by running migrate, or by loading the schema and seeding if needed'
     task configure: :environment do
-      if ActiveRecord::Base.connection.tables.any?
+      # Check if we have existing db tables
+      # The schema_migrations table will still exist if drop_tables was called
+      if ActiveRecord::Base.connection.tables.count > 1
         Rake::Task['db:migrate'].invoke
       else
         Rake::Task['db:schema:load'].invoke