ERROR: column "mirror_available" of relation "application_settings" already exists / Job Failed #67661039

Job #67661039 failed for d32010bd:

CE -> EE upgrade fails with:

ActiveRecord::StatementInvalid: PG::DuplicateColumn: ERROR:  column "mirror_available" of relation "application_settings" already exists
: ALTER TABLE "application_settings" ADD "mirror_available" boolean
/opt/gitlab/embedded/service/gitlab-rails/config/initializers/postgresql_limit_fix.rb:6:in `add_column'
/opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/database/migration_helpers.rb:420:in `rename_column_concurrently'
/opt/gitlab/embedded/service/gitlab-rails/ee/db/migrate/20171129150921_rename_remote_mirror_available_to_mirror_available.rb:9:in `up'

/cc @DouweM